feat(services): create mana-analytics, remove feedback/analytics/ai from auth

Extract feedback, analytics, and AI modules from mana-core-auth into
standalone mana-analytics service (Hono + Bun, Port 3064).

New service (services/mana-analytics/):
- User feedback CRUD with voting
- AI-powered feedback title generation via mana-llm
- Simplified from DuckDB analytics to pure PostgreSQL
- ~550 LOC

Removed from mana-core-auth:
- feedback/ module (6 files)
- analytics/ module (4 files)
- ai/ module (3 files)
- db/schema/feedback.schema.ts

mana-core-auth now contains ONLY pure auth:
- Better Auth (JWT, Sessions, 2FA, Passkeys, OIDC, Magic Links)
- Organizations/Guilds (membership management)
- API Keys, Security, Me (GDPR), Health, Metrics
- Ready for Phase 5: Hono rewrite

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/prometheus/prometheus.yml

@@ -102,15 +102,12 @@ scrape_configs:
     metrics_path: '/metrics'
     scrape_interval: 30s
 
-  # SkillTree Backend
-  - job_name: 'skilltree-backend'
-    static_configs:
-      - targets: ['skilltree-backend:3038']
-    metrics_path: '/metrics'
-    scrape_interval: 30s
+  # SkillTree Backend: REMOVED — migrated to local-first
 
   # Photos Backend: REMOVED — migrated to local-first + direct mana-media
 
+  # CityCorners Backend: REMOVED — migrated to local-first
+
   # Zitare Backend: REMOVED — migrated to local-first
 
   # Mukke Backend