feat(agents): add Collection Expert specialist + admin directive system
## Part A: Collection Expert Specialist Agent (7th specialist)
- New specialist: CollectionExpertService (Haiku 4.5, maxTurns 2)
- Analyzes user info completeness against 12-item weighted checklist
- Identifies missing fields, recommends next questions
- Category-specific priority adjustments (QMAS/GEP/IANG/TTPS/CIES/TechTAS)
- Tools: search_knowledge, get_user_context
- Admin directive injection: loads active directives from DB before each run
- Prompt: collection-expert-prompt.ts (completeness calc, validation rules, JSON output)
- Coordinator integration: invoke_collection_expert tool + case in executeAgentTool
- System prompt: section 2.6 usage guide, section 4.3 optional invocation reference
## Part B: Admin Directive System (parallel to assessment directives)
- ORM: CollectionDirectiveORM (collection_directives table)
- Types: general, priority, category, validation
- Multi-tenant with tenant_id + enabled indexes
- SQL: CREATE TABLE collection_directives in init-db.sql
- Controller: /conversations/admin/collection-directives (10 REST endpoints)
- CRUD + toggle + reset + preview + AI chat
- Chat Service: CollectionDirectiveChatService (Haiku 4.5 tool loop)
- 5 tools: list/create/update/delete/reset directives
- mutated flag for frontend cache invalidation
## Part C: Frontend Admin-Client
- Feature module: features/collection-config/ (5 files)
- API client, React Query hooks, Config page, Chat drawer
- Directive types: 通用指令/优先级调整/类别配置/验证规则
- Route: /collection-config in App.tsx
- Sidebar: FormOutlined icon, label '收集指令' in MainLayout.tsx
Files: 11 new, 9 modified | Backend + frontend compile clean
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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