docs(asl): Complete Tool 3 extraction workbench V2.0 development plan (v1.5)

ASL Tool 3 Development Plan:
- Architecture blueprint v1.5 (6 rounds of architecture review, 13 red lines)
- M1/M2/M3 sprint checklists (Skeleton Pipeline / HITL Workbench / Dynamic Template Engine)
- Code patterns cookbook (9 chapters: Fan-out, Prompt engineering, ACL, SSE dual-track, etc.)
- Key patterns: Fan-out with Last Child Wins, Optimistic Locking, teamConcurrency throttling
- PKB ACL integration (anti-corruption layer), MinerU Cache-Aside, NOTIFY/LISTEN cross-pod SSE
- Data consistency snapshot for long-running extraction tasks

Platform capability:
- Add distributed Fan-out task pattern development guide (7 patterns + 10 anti-patterns)
- Add system-level async architecture risk analysis blueprint
- Add PDF table extraction engine design and usage guide (MinerU integration)
- Add table extraction source code (TableExtractionManager + MinerU engine)

Documentation updates:
- Update ASL module status with Tool 3 V2.0 plan readiness
- Update system status document (v6.2) with latest milestones
- Add V2.0 product requirements, prototypes, and data dictionary specs
- Add architecture review documents (4 rounds of review feedback)
- Add test PDF files for extraction validation

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/package.json

@@ -32,6 +32,7 @@
     "@prisma/client": "^6.17.0",
     "@types/form-data": "^2.2.1",
     "@wecom/crypto": "^1.0.1",
+    "adm-zip": "^0.5.16",
     "ajv": "^8.17.1",
     "ali-oss": "^6.23.0",
     "axios": "^1.12.2",
@@ -60,6 +61,7 @@
     "zod": "^4.1.12"
   },
   "devDependencies": {
+    "@types/adm-zip": "^0.5.7",
     "@types/ali-oss": "^6.23.1",
     "@types/bcryptjs": "^2.4.6",
     "@types/js-yaml": "^4.0.9",