feat: 新增智能体服务订阅功能（REQ-131~134）

企业、个人用户和 OPC 均可订阅运营商提供的智能体服务：
- 智能体服务目录（6 个智能体：电商视觉/AI漫剧/企业智能体/数据标注/硬件供应链/跨境文案）
- 订阅管理（月度/季度/年度套餐、用量跟踪、续费/取消）
- 调用记录与账单（按月计费、算力券抵扣）
- 新增 agent.html 页面，opc/enterprise/personal/operator 角色可见

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Demo/assets/mock.json

@@ -3262,5 +3262,186 @@
         ]
       }
     ]
+  },
+  "agent": {
+    "catalog": [
+      {
+        "code": "AGT_001",
+        "name": "电商视觉智能体",
+        "desc": "商品主图/详情页/Banner 自动生成，支持批量出图",
+        "category": "电商视觉",
+        "price": "¥299/月",
+        "calls": "1000 次/月",
+        "rating": 4.8,
+        "users": 128,
+        "status": [
+          "热销",
+          "ok"
+        ],
+        "tags": [
+          "商品主图",
+          "详情页",
+          "Banner"
+        ]
+      },
+      {
+        "code": "AGT_002",
+        "name": "AI 漫剧分镜智能体",
+        "desc": "剧本→分镜→线稿→上色全流程辅助，支持风格切换",
+        "category": "AI 漫剧",
+        "price": "¥499/月",
+        "calls": "500 次/月",
+        "rating": 4.6,
+        "users": 56,
+        "status": [
+          "热销",
+          "ok"
+        ],
+        "tags": [
+          "分镜",
+          "上色",
+          "风格"
+        ]
+      },
+      {
+        "code": "AGT_003",
+        "name": "企业智能体 FDE",
+        "desc": "企业知识库构建+智能问答+工作流自动化",
+        "category": "企业智能体",
+        "price": "¥999/月",
+        "calls": "不限",
+        "rating": 4.9,
+        "users": 32,
+        "status": [
+          "企业版",
+          "pri"
+        ],
+        "tags": [
+          "知识库",
+          "问答",
+          "自动化"
+        ]
+      },
+      {
+        "code": "AGT_004",
+        "name": "数据标注智能体",
+        "desc": "图像/文本/音频预标注+人工校验，标注效率提升 5 倍",
+        "category": "数据标注",
+        "price": "¥199/月",
+        "calls": "5000 次/月",
+        "rating": 4.5,
+        "users": 85,
+        "status": [
+          "在售",
+          "ok"
+        ],
+        "tags": [
+          "预标注",
+          "校验",
+          "批量"
+        ]
+      },
+      {
+        "code": "AGT_005",
+        "name": "硬件方案智能体",
+        "desc": "AI 产品定义→工业设计→BOM 清单→打样建议",
+        "category": "硬件供应链",
+        "price": "¥799/月",
+        "calls": "200 次/月",
+        "rating": 4.7,
+        "users": 18,
+        "status": [
+          "新品",
+          "warn"
+        ],
+        "tags": [
+          "产品定义",
+          "BOM",
+          "打样"
+        ]
+      },
+      {
+        "code": "AGT_006",
+        "name": "跨境文案智能体",
+        "desc": "多语言商品描述/广告文案/SEO 优化自动生成",
+        "category": "跨境电商",
+        "price": "¥199/月",
+        "calls": "2000 次/月",
+        "rating": 4.4,
+        "users": 142,
+        "status": [
+          "在售",
+          "ok"
+        ],
+        "tags": [
+          "多语言",
+          "文案",
+          "SEO"
+        ]
+      }
+    ],
+    "mySubs": [
+      {
+        "code": "SUB_0001",
+        "agent": "AGT_001 电商视觉智能体",
+        "plan": "月度订阅",
+        "price": "¥299/月",
+        "calls": "326 / 1000",
+        "expire": "2026-10-15",
+        "status": [
+          "使用中",
+          "ok"
+        ]
+      },
+      {
+        "code": "SUB_0002",
+        "agent": "AGT_004 数据标注智能体",
+        "plan": "月度订阅",
+        "price": "¥199/月",
+        "calls": "1820 / 5000",
+        "expire": "2026-10-20",
+        "status": [
+          "使用中",
+          "ok"
+        ]
+      }
+    ],
+    "usage": [
+      {
+        "date": "09-14",
+        "agent": "AGT_001 电商视觉",
+        "calls": 28,
+        "cost": "¥0",
+        "task": "商品主图 ×28"
+      },
+      {
+        "date": "09-13",
+        "agent": "AGT_001 电商视觉",
+        "calls": 45,
+        "cost": "¥0",
+        "task": "详情页 ×15"
+      },
+      {
+        "date": "09-12",
+        "agent": "AGT_004 数据标注",
+        "calls": 320,
+        "cost": "¥0",
+        "task": "图像标注 320 条"
+      },
+      {
+        "date": "09-11",
+        "agent": "AGT_001 电商视觉",
+        "calls": 18,
+        "cost": "¥0",
+        "task": "Banner ×6"
+      }
+    ],
+    "billing": {
+      "month": "2026-09",
+      "subs": "¥498/月",
+      "calls": 2211,
+      "extra": "¥0",
+      "total": "¥498"
+    }
   }
 }