feat: Implement Phase 5 Quest System (100% complete)

Add YAML-driven quest system with context-aware offering:

Core Implementation:
- Quest data models (Quest, QuestObjective, QuestReward, QuestTriggers)
- QuestService for YAML loading and caching
- QuestEligibilityService with level, location, and probability filtering
- LoreService stub (MockLoreService) ready for Phase 6 Weaviate integration

Quest Content:
- 5 example quests across difficulty tiers (2 easy, 2 medium, 1 hard)
- Quest-centric design: quests define their NPC givers
- Location-based probability weights for natural quest offering

AI Integration:
- Quest offering section in npc_dialogue.j2 template
- Response parser extracts [QUEST_OFFER:quest_id] markers
- AI naturally weaves quest offers into NPC conversations

API Endpoints:
- POST /api/v1/quests/accept - Accept quest offer
- POST /api/v1/quests/decline - Decline quest offer
- POST /api/v1/quests/progress - Update objective progress
- POST /api/v1/quests/complete - Complete quest, claim rewards
- POST /api/v1/quests/abandon - Abandon active quest
- GET /api/v1/characters/{id}/quests - List character quests
- GET /api/v1/quests/{quest_id} - Get quest details

Frontend:
- Quest tracker sidebar with HTMX integration
- Quest offer modal for accept/decline flow
- Quest detail modal for viewing progress
- Combat service integration for kill objective tracking

Testing:
- Unit tests for Quest models and serialization
- Integration tests for full quest lifecycle
- Comprehensive test coverage for eligibility service

Documentation:
- Reorganized docs into /docs/phases/ structure
- Added Phase 5-12 planning documents
- Updated ROADMAP.md with new structure

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

api/app/data/quests/medium/bandit_threat.yaml

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+# Bandit Threat - Combat-focused medium quest
+quest_id: quest_bandit_threat
+name: "The Bandit Threat"
+description: |
+  A gang of bandits has been terrorizing travelers on the roads
+  near Crossville. Mayor Aldric is offering a substantial reward
+  for anyone who can deal with the threat permanently.
+difficulty: medium
+
+# NPC Quest Givers
+quest_giver_npc_ids:
+  - npc_mayor_aldric
+quest_giver_name: "Mayor Aldric Thornwood"
+
+# Location context
+location_id: crossville_village
+region_id: crossville
+
+# Offering conditions
+offering_triggers:
+  location_types: ["town", "official"]
+  specific_locations: ["crossville_village", "crossville_town_hall"]
+  min_character_level: 3
+  max_character_level: 8
+  required_quests_completed: []
+  probability_weights:
+    town: 0.20
+    official: 0.40
+
+# NPC-specific offer dialogue
+npc_offer_dialogues:
+  npc_mayor_aldric:
+    dialogue: |
+      *straightens his chain of office* Crossville faces a grave threat.
+      Bandits have been attacking merchants on the eastern road. Trade
+      is suffering, and I fear for our people's safety. The village
+      will pay handsomely for someone who can... resolve this situation.
+    conditions:
+      min_relationship: 35
+      required_flags: []
+      forbidden_flags: ["failed_bandit_quest"]
+
+# What NPCs know
+npc_quest_knowledge:
+  npc_mayor_aldric:
+    - "The bandits have a camp somewhere in the eastern forest"
+    - "They're led by a man called 'Blackhand' - a former soldier"
+    - "At least a dozen bandits, well-armed and organized"
+    - "Three merchant caravans have been hit in the past month"
+    - "The militia is too small to mount an assault"
+
+# Embedded lore
+lore_context:
+  backstory: |
+    The bandit leader Blackhand was once a soldier in the King's
+    army. After the war ended, he turned to brigandry rather than
+    return to a life of farming. His military training makes his
+    gang far more dangerous than common thieves.
+  world_connections:
+    - "Many veterans turned to banditry after the war - a kingdom-wide problem"
+    - "The mayor may know more about Blackhand than he lets on"
+  regional_hints:
+    - "The eastern forest road is the main trade route to the capital"
+    - "Without trade, Crossville's economy will suffer greatly"
+
+# Narrative hooks
+dialogue_templates:
+  narrative_hooks:
+    - "speaks of the economic impact on the village"
+    - "mentions concerned merchants refusing to travel"
+    - "hints at political pressure from higher authorities"
+    - "shows genuine worry for the common folk"
+  ambient_hints:
+    - "You notice fewer merchants in the market than expected"
+    - "Guards at the village gate look nervous and understaffed"
+    - "Wanted posters for 'Blackhand' are posted on walls"
+
+# Objectives
+objectives:
+  - objective_id: find_camp
+    description: "Locate the bandit camp in the eastern forest"
+    objective_type: discover
+    required_progress: 1
+    target_location_id: bandit_camp
+
+  - objective_id: defeat_bandits
+    description: "Defeat the bandits"
+    objective_type: kill
+    required_progress: 8
+    target_enemy_type: bandit
+
+  - objective_id: defeat_blackhand
+    description: "Defeat or capture Blackhand"
+    objective_type: kill
+    required_progress: 1
+    target_enemy_type: blackhand_leader
+
+# Rewards
+rewards:
+  gold: 200
+  experience: 350
+  items:
+    - blackhand_sword
+  relationship_bonuses:
+    npc_mayor_aldric: 20
+  unlocks_quests: ["quest_mayors_secret"]
+  reveals_locations: ["bandit_camp"]
+
+# Completion dialogue
+completion_dialogue:
+  npc_mayor_aldric: |
+    *visible relief* The bandits are dealt with? This is excellent
+    news. You've done Crossville a great service. *hands over a
+    heavy coin purse* Your reward, as promised. And... I may have
+    other matters that require someone of your capabilities. We
+    should speak again soon.
+
+tags:
+  - combat
+  - exploration
+  - story

api/app/data/quests/medium/missing_shipment.yaml

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+# Missing Shipment - Investigation and exploration quest
+quest_id: quest_missing_shipment
+name: "The Missing Shipment"
+description: |
+  A shipment of dwarven goods, including rare ale and tools, never
+  arrived from the mountain passes. The merchant who was transporting
+  it has not been seen in days. Something must have happened on the road.
+difficulty: medium
+
+# NPC Quest Givers
+quest_giver_npc_ids:
+  - npc_grom_ironbeard
+  - npc_blacksmith_hilda
+quest_giver_name: "Grom Ironbeard"
+
+# Location context
+location_id: crossville_tavern
+region_id: crossville
+
+# Offering conditions
+offering_triggers:
+  location_types: ["tavern", "shop"]
+  specific_locations: ["crossville_tavern", "crossville_forge"]
+  min_character_level: 4
+  max_character_level: 10
+  required_quests_completed:
+    - quest_cellar_rats  # Must have helped Grom before
+  probability_weights:
+    tavern: 0.30
+    shop: 0.25
+
+# NPC-specific offer dialogue
+npc_offer_dialogues:
+  npc_grom_ironbeard:
+    dialogue: |
+      *polishes glass nervously* My cousin Durgin was supposed to
+      arrive three days ago with a shipment from the mountain holds.
+      Dwarven stout, quality ore, fine tools. He's never late.
+      *voice drops* Something's happened on the mountain road.
+      I'm too old to go myself, but I'll pay well for news of him.
+    conditions:
+      min_relationship: 50
+      required_flags: ["completed_cellar_rats"]
+      forbidden_flags: []
+
+  npc_blacksmith_hilda:
+    dialogue: |
+      *frowns at empty shelves* My shipment of dwarven ore never
+      arrived. Durgin Stonefoot was bringing it - he's Grom's cousin.
+      Without that ore, I can't forge anything worth selling.
+      The mountain road can be dangerous... would you look into it?
+    conditions:
+      min_relationship: 40
+      required_flags: []
+      forbidden_flags: []
+
+# What NPCs know
+npc_quest_knowledge:
+  npc_grom_ironbeard:
+    - "Durgin always takes the north pass - it's longer but safer"
+    - "He travels with two guards and a pack mule"
+    - "The shipment is worth at least 500 gold"
+    - "There have been rumors of strange creatures in the mountains lately"
+  npc_blacksmith_hilda:
+    - "Durgin is reliable - never missed a delivery in 15 years"
+    - "The ore he brings is from the deep mines - best quality"
+    - "Grom is worried sick about his cousin"
+
+# Embedded lore
+lore_context:
+  backstory: |
+    Durgin Stonefoot has been making the mountain crossing for years,
+    bringing goods from the dwarven holds to the human settlements
+    below. He's a seasoned traveler who knows every rock and crevice
+    of the mountain road.
+  world_connections:
+    - "The mountain passes have seen increased monster activity"
+    - "Trade routes between dwarves and humans are vital to both economies"
+  regional_hints:
+    - "The north pass winds through old ruins from the First Age"
+    - "Travelers speak of hearing strange howls at night"
+
+# Narrative hooks
+dialogue_templates:
+  narrative_hooks:
+    - "mentions family connection to the missing merchant"
+    - "worries about more than just the lost goods"
+    - "offers personal items as a bonus reward"
+    - "knows something about the mountain dangers"
+  ambient_hints:
+    - "Empty barrels line the cellar where shipments should be"
+    - "Other merchants discuss avoiding the mountain road"
+
+# Objectives
+objectives:
+  - objective_id: search_road
+    description: "Search the mountain road for signs of the shipment"
+    objective_type: travel
+    required_progress: 1
+    target_location_id: mountain_pass
+
+  - objective_id: find_durgin
+    description: "Discover what happened to Durgin"
+    objective_type: discover
+    required_progress: 1
+    target_location_id: durgin_campsite
+
+  - objective_id: recover_goods
+    description: "Recover the missing goods (if possible)"
+    objective_type: collect
+    required_progress: 1
+    target_item_id: dwarven_shipment
+
+# Rewards
+rewards:
+  gold: 150
+  experience: 300
+  items:
+    - dwarven_ale_keg
+  relationship_bonuses:
+    npc_grom_ironbeard: 15
+    npc_blacksmith_hilda: 10
+  unlocks_quests: ["quest_mountain_menace"]
+  reveals_locations: ["mountain_pass", "durgin_campsite"]
+
+# Completion dialogue
+completion_dialogue:
+  npc_grom_ironbeard: |
+    *relief floods his face* Durgin is alive? Thank the ancestors!
+    *takes the recovered goods* And you brought back what you could.
+    You've done more than I could ask. Here's your payment, and...
+    *pulls out a small flask* ...my personal reserve. Drink it in
+    good health, friend.
+
+  npc_blacksmith_hilda: |
+    *examines the recovered ore* This will do nicely. Thank you
+    for finding out what happened. Poor Durgin - I hope he recovers.
+    You've earned both coin and my gratitude.
+
+tags:
+  - investigation
+  - exploration
+  - story