feat: add CI/CD and PR-Agent configuration

.github/CODEOWNERS

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+# CODEOWNERS - Repository ownership
+# https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
+
+# Default owners for everything
+* @BerryUIKI
+
+# Documentation
+/docs/ @BerryUIKI
+/README*.md @BerryUIKI
+/CHANGELOG.md @BerryUIKI
+/AGENTS.md @BerryUIKI
+
+# Frontend
+/apps/desktop/src/ @BerryUIKI
+/packages/ @BerryUIKI
+
+# Backend
+/apps/desktop/src-tauri/ @BerryUIKI
+/crates/ @BerryUIKI
+
+# CI/CD
+/.github/ @BerryUIKI
+/scripts/ @BerryUIKI
+
+# Database
+/apps/desktop/src-tauri/migrations/ @BerryUIKI
+/apps/desktop/src-tauri/src/database/ @BerryUIKI
+
+# Security
+/apps/desktop/src-tauri/src/security/ @BerryUIKI
+/apps/desktop/src-tauri/capabilities/ @BerryUIKI
+/SECURITY.md @BerryUIKI
+
+# Plugins
+/plugins/ @BerryUIKI
+
+# Build configuration
+/package.json @BerryUIKI
+/Cargo.toml @BerryUIKI
+/pnpm-workspace.yaml @BerryUIKI
+/vite.config.ts @BerryUIKI

.github/dependabot.yml

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+# Dependabot configuration for automated dependency updates
+# https://docs.github.com/en/code-security/dependabot
+
+version: 2
+
+updates:
+  # npm/pnpm dependencies
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "Asia/Shanghai"
+    open-pull-requests-limit: 10
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "frontend"
+    reviewers:
+      - BerryUIKI
+    assignees:
+      - BerryUIKI
+    groups:
+      production-dependencies:
+        dependency-type: "production"
+      development-dependencies:
+        dependency-type: "development"
+
+  # Rust dependencies
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "Asia/Shanghai"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "chore"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "rust"
+      - "backend"
+    reviewers:
+      - BerryUIKI
+    assignees:
+      - BerryUIKI
+
+  # GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+      day: "monday"
+      time: "09:00"
+      timezone: "Asia/Shanghai"
+    open-pull-requests-limit: 5
+    commit-message:
+      prefix: "ci"
+      include: "scope"
+    labels:
+      - "dependencies"
+      - "ci"
+    reviewers:
+      - BerryUIKI
+    assignees:
+      - BerryUIKI

.github/labeler.yml

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+# Auto-labeler configuration for PRs
+# https://github.com/actions/labeler
+
+# Frontend changes
+frontend:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'apps/desktop/src/**/*'
+      - 'packages/**/*.ts'
+      - 'packages/**/*.tsx'
+      - '*.tsx'
+      - '*.ts'
+
+# Backend changes  
+backend:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'apps/desktop/src-tauri/**/*.rs'
+      - 'crates/**/*.rs'
+      - 'Cargo.toml'
+      - 'Cargo.lock'
+
+# Rust specific
+rust:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/*.rs'
+      - 'Cargo.toml'
+      - 'Cargo.lock'
+
+# TypeScript specific
+typescript:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/*.ts'
+      - '**/*.tsx'
+
+# Documentation
+documentation:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'docs/**/*.md'
+      - 'README*.md'
+      - 'CHANGELOG.md'
+      - 'CONTRIBUTING.md'
+      - 'AGENTS.md'
+
+# Database/Schema
+database:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'apps/desktop/src-tauri/migrations/**/*.sql'
+      - 'apps/desktop/src-tauri/src/database/**/*'
+
+# CI/CD
+ci:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '.github/workflows/**/*'
+      - '.github/labeler.yml'
+      - 'scripts/*.sh'
+
+# Plugins
+plugins:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'plugins/**/*'
+
+# Tests
+tests:
+  - changed-files:
+    - any-glob-to-any-file:
+      - '**/*.test.ts'
+      - '**/*.test.tsx'
+      - '**/*.spec.ts'
+      - '**/*.spec.tsx'
+      - '**/tests/**/*.rs'
+
+# Security sensitive
+security:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'apps/desktop/src-tauri/src/security/**/*'
+      - 'apps/desktop/src-tauri/capabilities/**/*'
+      - '.env.example'
+
+# UI/Styling
+ui:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'apps/desktop/src/styles/**/*'
+      - 'apps/desktop/src/components/**/*'
+      - 'tailwind.config.*'
+      - '**/*.css'
+
+# Configuration
+config:
+  - changed-files:
+    - any-glob-to-any-file:
+      - 'package.json'
+      - 'pnpm-workspace.yaml'
+      - 'tsconfig*.json'
+      - 'vite.config.*'
+      - '.prettierrc'
+      - '.editorconfig'
+      - 'eslint.config.*'
+      - 'vitest.config.*'