feat(AI接入): 内置 MCP 服务与个人 Token 管理

- 新增 /api/mcp (Streamable HTTP) 与 41 个工具: 项目/看板列/任务/清单/打卡; - 新增 McpToken 模型与迁移, DB 仅存 SHA-256 哈希, token 绑定用户; - 新增 /api/mcp-tokens 增删改查, 支持独立命名 (如 R1); - 「我的」页新增 AI 接入 (MCP) 区块: 地址复制/新建/一次性展示/删除; - 补充 docs/MCP.md 与样式

prisma/migrations/20261106000000_mcp_tokens/migration.sql

@@ -0,0 +1,20 @@
+-- AI 接入 (MCP): 个人授权 token, 与用户绑定, 独立命名
+CREATE TABLE "McpToken" (
+    "id" SERIAL NOT NULL,
+    "userId" INTEGER NOT NULL,
+    "name" VARCHAR(32) NOT NULL,
+    "prefix" VARCHAR(16) NOT NULL,
+    "tokenHash" VARCHAR(64) NOT NULL,
+    "lastUsedAt" TIMESTAMP(3),
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "McpToken_pkey" PRIMARY KEY ("id")
+);
+
+CREATE UNIQUE INDEX "McpToken_tokenHash_key" ON "McpToken"("tokenHash");
+CREATE UNIQUE INDEX "McpToken_userId_name_key" ON "McpToken"("userId", "name");
+CREATE INDEX "McpToken_userId_idx" ON "McpToken"("userId");
+
+ALTER TABLE "McpToken" ADD CONSTRAINT "McpToken_userId_fkey"
+    FOREIGN KEY ("userId") REFERENCES "User"("id") ON DELETE CASCADE ON UPDATE CASCADE;