feat(v5.2.0): Complete skills system integration and config cleanup

Core Changes:
- **Skills System**: Added codeagent, product-requirements, prototype-prompt-generator to skill-rules.json
- **Config Cleanup**: Removed deprecated gh module from config.json
- **Workflow Update**: Changed memorys/CLAUDE.md to use codeagent skill instead of codex

Details:
- config.json:88-119: Removed gh module (github-workflow directory doesn't exist)
- skills/skill-rules.json:24-114: Added 3 new skills with keyword/pattern triggers
  - codeagent: multi-backend, parallel task execution
  - product-requirements: PRD, requirements gathering
  - prototype-prompt-generator: UI/UX design specifications
- memorys/CLAUDE.md:3,24-25: Updated Codex skill → Codeagent skill

Verification:
- All skill activation tests PASS
- codeagent skill triggers correctly on keyword match

Generated with swe-agent-bot

Co-Authored-By: swe-agent-bot <agent@swe-agent.ai>

skills/skill-rules.json

@@ -21,6 +21,29 @@
         ]
       }
     },
+    "codeagent": {
+      "type": "execution",
+      "enforcement": "suggest",
+      "priority": "high",
+      "promptTriggers": {
+        "keywords": [
+          "codeagent",
+          "multi-backend",
+          "backend selection",
+          "parallel task",
+          "多后端",
+          "并行任务",
+          "gemini",
+          "claude backend"
+        ],
+        "intentPatterns": [
+          "\\bcodeagent\\b",
+          "backend\\s+(codex|claude|gemini)",
+          "parallel.*task",
+          "multi.*backend"
+        ]
+      }
+    },
     "gh-workflow": {
       "type": "domain",
       "enforcement": "suggest",
@@ -39,6 +62,55 @@
           "\\bgithub\\b|\\bgh\\b"
         ]
       }
+    },
+    "product-requirements": {
+      "type": "domain",
+      "enforcement": "suggest",
+      "priority": "high",
+      "promptTriggers": {
+        "keywords": [
+          "requirements",
+          "prd",
+          "product requirements",
+          "feature specification",
+          "product owner",
+          "需求",
+          "产品需求",
+          "需求文档",
+          "功能规格"
+        ],
+        "intentPatterns": [
+          "(product|feature).*requirement",
+          "\\bPRD\\b",
+          "requirements?.*document",
+          "(gather|collect|define|write).*requirement"
+        ]
+      }
+    },
+    "prototype-prompt-generator": {
+      "type": "domain",
+      "enforcement": "suggest",
+      "priority": "medium",
+      "promptTriggers": {
+        "keywords": [
+          "prototype",
+          "ui design",
+          "ux design",
+          "mobile app design",
+          "web app design",
+          "原型",
+          "界面设计",
+          "UI设计",
+          "UX设计",
+          "移动应用设计"
+        ],
+        "intentPatterns": [
+          "(create|generate|design).*(prototype|UI|UX|interface)",
+          "(mobile|web).*app.*(design|prototype)",
+          "prototype.*prompt",
+          "design.*system"
+        ]
+      }
     }
   }
 }