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>

public_web/templates/game/partials/sidebar_quests.html

@@ -1,36 +1,83 @@
 {#
 Quests Accordion Content
 Shows active quests with objectives and progress
+Enhanced with HTMX for live updates and clickable quest details
 #}
+<div id="quest-list-container"
+     hx-get="{{ url_for('game.quests_accordion', session_id=session_id) }}"
+     hx-trigger="questAccepted from:body, questCompleted from:body, questAbandoned from:body, combatEnded from:body"
+     hx-swap="innerHTML">
+
 {% if quests %}
 <div class="quest-list">
     {% for quest in quests %}
-    <div class="quest-item">
+    <div class="quest-item {% if quest.is_complete %}quest-item--ready{% endif %}"
+         hx-get="{{ url_for('game.quest_detail', session_id=session_id, quest_id=quest.quest_id) }}"
+         hx-target="#modal-container"
+         hx-swap="innerHTML"
+         role="button"
+         tabindex="0"
+         aria-label="View quest details: {{ quest.name }}">
+
+        {# Ready to Complete Banner #}
+        {% if quest.is_complete %}
+        <div class="quest-ready-banner">
+            <span class="ready-icon">&#10003;</span>
+            <span class="ready-text">Ready to Turn In!</span>
+        </div>
+        {% endif %}
+
         <div class="quest-header">
             <span class="quest-name">{{ quest.name }}</span>
             <span class="quest-difficulty quest-difficulty--{{ quest.difficulty }}">
                 {{ quest.difficulty }}
             </span>
         </div>
+
+        {% if quest.quest_giver %}
         <div class="quest-giver">From: {{ quest.quest_giver }}</div>
+        {% endif %}
+
         <div class="quest-objectives">
             {% for objective in quest.objectives %}
-            <div class="quest-objective">
-                <span class="quest-objective-check {% if objective.completed %}completed{% endif %}">
-                    {% if objective.completed %}✓{% endif %}
+            <div class="quest-objective {% if objective.is_complete %}objective-complete{% endif %}">
+                <span class="quest-objective-check">
+                    {% if objective.is_complete %}&#10003;{% else %}&#9675;{% endif %}
+                </span>
+                <span class="quest-objective-text {% if objective.is_complete %}text-strikethrough{% endif %}">
+                    {{ objective.description }}
                 </span>
-                <span class="quest-objective-text">{{ objective.description }}</span>
                 {% if objective.required > 1 %}
-                <span class="quest-objective-progress">{{ objective.current }}/{{ objective.required }}</span>
+                <span class="quest-objective-progress">
+                    {{ objective.current }}/{{ objective.required }}
+                </span>
                 {% endif %}
             </div>
             {% endfor %}
         </div>
+
+        {# Progress Bar for Multi-objective Quests #}
+        {% if quest.objectives|length > 1 %}
+        {% set completed_count = quest.objectives|selectattr('is_complete')|list|length %}
+        {% set total_count = quest.objectives|length %}
+        <div class="quest-overall-progress">
+            <div class="mini-progress-bar">
+                <div class="mini-progress-fill"
+                     style="width: {{ (completed_count / total_count * 100)|int }}%">
+                </div>
+            </div>
+            <span class="mini-progress-text">{{ completed_count }}/{{ total_count }}</span>
+        </div>
+        {% endif %}
     </div>
     {% endfor %}
 </div>
 {% else %}
 <div class="quest-empty">
-    No active quests. Talk to NPCs to find adventures!
+    <span class="empty-icon">&#128220;</span>
+    <p class="empty-text">No active quests.</p>
+    <p class="empty-hint">Talk to NPCs to find adventures!</p>
 </div>
 {% endif %}
+
+</div>