feat: AI 助手模型管理（CRUD、会话绑定、自动化验收）

- Flyway V6：模型表、默认种子、ai_chat_session.model_id 回填
- 管理端 /api/admin/ai/models；用户端选模与新会话绑定
- 禁用模型后会话只读（5009）；chat 按会话 modelCode 调 DashScope
- 前端 AiModels 页、助手模型选择器与 localStorage
- 单测、AiModelManagementApiIT、Playwright E2E；e2e Profile 关闭注解限流
- 技术实施文档与验收报告；移除过期冲突分析文档

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

e2e/playwright.config.js

@@ -0,0 +1,50 @@
+import { defineConfig, devices } from '@playwright/test'
+import path from 'path'
+import { fileURLToPath } from 'url'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+const repoRoot = path.resolve(__dirname, '..')
+
+const isWin = process.platform === 'win32'
+const mvn = isWin ? 'mvn.cmd' : 'mvn'
+
+const backendStart = isWin
+  ? `cmd /c "${mvn} -pl jog-admin -am install -Dmaven.frontend.skip=true -DskipTests && ${mvn} -pl jog-admin spring-boot:run -Dmaven.frontend.skip=true -Dspring-boot.run.profiles=e2e"`
+  : `${mvn} -pl jog-admin -am install -Dmaven.frontend.skip=true -DskipTests && ${mvn} -pl jog-admin spring-boot:run -Dmaven.frontend.skip=true -Dspring-boot.run.profiles=e2e`
+
+export default defineConfig({
+  testDir: './tests',
+  timeout: 120_000,
+  expect: { timeout: 15_000 },
+  fullyParallel: false,
+  workers: 1,
+  retries: 0,
+  reporter: [['list']],
+  use: {
+    baseURL: 'http://localhost:5173',
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+  },
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+  ],
+  webServer: [
+    {
+      command: backendStart,
+      url: 'http://localhost:8080/api/public/captcha',
+      reuseExistingServer: !process.env.CI,
+      timeout: 300_000,
+      cwd: repoRoot,
+    },
+    {
+      command: 'npm run dev',
+      url: 'http://localhost:5173',
+      reuseExistingServer: !process.env.CI,
+      timeout: 120_000,
+      cwd: path.join(repoRoot, 'jog-frontend'),
+    },
+  ],
+})