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-lock.json

@@ -15,6 +15,7 @@
         "@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",
@@ -43,6 +44,7 @@
         "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",
@@ -1028,6 +1030,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/adm-zip": {
+      "version": "0.5.7",
+      "resolved": "https://registry.npmmirror.com/@types/adm-zip/-/adm-zip-0.5.7.tgz",
+      "integrity": "sha512-DNEs/QvmyRLurdQPChqq0Md4zGvPwHerAJYWk9l2jCbD1VPpnzRJorOdiq4zsw09NFbYnhfsoEhWtxIzXpn2yw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/node": "*"
+      }
+    },
     "node_modules/@types/ali-oss": {
       "version": "6.23.1",
       "resolved": "https://registry.npmmirror.com/@types/ali-oss/-/ali-oss-6.23.1.tgz",
@@ -1202,6 +1214,15 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/adm-zip": {
+      "version": "0.5.16",
+      "resolved": "https://registry.npmmirror.com/adm-zip/-/adm-zip-0.5.16.tgz",
+      "integrity": "sha512-TGw5yVi4saajsSEgz25grObGHEUaDrniwvA2qwSC060KfqGPdglhvPMA2lPIoxs3PQIItj2iag35fONcQqgUaQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.0"
+      }
+    },
     "node_modules/agentkeepalive": {
       "version": "3.5.3",
       "resolved": "https://registry.npmmirror.com/agentkeepalive/-/agentkeepalive-3.5.3.tgz",