chore: 清理 v2 过时残留（旧 API 文档/人格配置/部署目录/compose/启动脚本/密钥备份/旧CI），更新 gitignore

.github/workflows/ci.yml

@@ -1,32 +0,0 @@
-name: Cyrene CI
-on: [push, pull_request]
-jobs:
-  backend:
-    runs-on: ubuntu-latest
-    services:
-      postgres:
-        image: pgvector/pgvector:pg16
-        env: {POSTGRES_USER: cyrene, POSTGRES_PASSWORD: cyrene_pass, POSTGRES_DB: cyrene_ai}
-        ports: [5432:5432]
-        options: >-
-          --health-cmd pg_isready --health-interval 10s --health-timeout 3s --health-retries 5
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with: {go-version: '1.26'}
-      - run: go test ./...
-        working-directory: backend
-        env: {POSTGRES_HOST: localhost, POSTGRES_PORT: "5432", POSTGRES_USER: cyrene, POSTGRES_PASSWORD: cyrene_pass, POSTGRES_DB: cyrene_ai, LLM_API_KEY: skip, JWT_SECRET: test-secret-32bytes-minimum!!, ADMIN_PASSWORD: test12345}
-
-  frontend:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
-        with: {node-version: '22'}
-      - run: npm ci
-        working-directory: frontend/web
-      - run: npx tsc --noEmit
-        working-directory: frontend/web
-      - run: npm run build
-        working-directory: frontend/web