ci: harden release supply chain

- Add CODEOWNERS so PRs to main require owner review (closes the gap
  where two collaborators could approve each other's changes).
- Gate the release job behind a 'release' environment, so signing
  secrets are only unlocked after manual approval.
- Stop ignoring the whole .github directory; this had been silently
  swallowing labeler.yml and workflows/labeler.yml, which are now tracked.

Paired with a tag ruleset (created out-of-band) that restricts creation
of v* tags to admins, this prevents a write collaborator from pushing a
tag to trigger a signed release build.

.github/CODEOWNERS

@@ -0,0 +1,14 @@
+# Code owners for cc-switch
+#
+# Branch protection on `main` has "Require review from Code Owners" enabled.
+# With this file present, a PR cannot merge to `main` without an approval from
+# the owner below. This closes the gap where two collaborators could approve
+# each other's malicious PRs (a single non-owner approval is no longer enough).
+
+# Global fallback: every PR needs owner approval before merging to main.
+*                 @farion1231
+
+# Most sensitive paths — CI/signing/release and the Rust backend. Listed
+# explicitly so they stay locked even if the global rule above is relaxed later.
+/.github/         @farion1231
+/src-tauri/       @farion1231

.github/labeler.yml

@@ -0,0 +1,74 @@
+# Configuration for actions/labeler v5
+# Automatically labels PRs based on changed file paths
+
+frontend:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src/**"
+          - "index.html"
+          - "vite.config.ts"
+          - "vitest.config.ts"
+          - "tailwind.config.cjs"
+          - "postcss.config.cjs"
+          - "tsconfig.json"
+          - "tsconfig.node.json"
+          - "components.json"
+          - "tests/**"
+
+backend:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src-tauri/**"
+
+i18n:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src/locales/**"
+
+actions:
+  - changed-files:
+      - any-glob-to-any-file:
+          - ".github/**"
+
+dependencies:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "package.json"
+          - "pnpm-lock.yaml"
+          - "pnpm-workspace.yaml"
+          - "src-tauri/Cargo.toml"
+          - "src-tauri/Cargo.lock"
+
+documentation:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "*.md"
+          - "docs/**"
+          - "LICENSE"
+
+mcp:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src/components/mcp/**"
+          - "src/lib/api/mcp.ts"
+          - "src-tauri/src/mcp/**"
+          - "src-tauri/src/claude_mcp.rs"
+          - "src-tauri/src/gemini_mcp.rs"
+          - "src-tauri/src/commands/mcp.rs"
+
+skills:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src/components/skills/**"
+          - "src/lib/api/skills.ts"
+          - "src-tauri/src/commands/skill.rs"
+          - "src-tauri/src/services/skill.rs"
+          - "src-tauri/src/database/dao/skills.rs"
+
+proxy:
+  - changed-files:
+      - any-glob-to-any-file:
+          - "src/components/proxy/**"
+          - "src/lib/api/proxy.ts"
+          - "src-tauri/src/proxy/**"
+          - "src-tauri/src/commands/proxy.rs"

.github/workflows/labeler.yml

@@ -0,0 +1,17 @@
+name: Label PRs
+
+on:
+  pull_request_target:
+    types: [opened, synchronize, reopened]
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/labeler@v5
+        with:
+          sync-labels: true

.github/workflows/release.yml

@@ -15,6 +15,7 @@ concurrency:
 jobs:
   release:
     runs-on: ${{ matrix.os }}
+    environment: release
     strategy:
       fail-fast: false
       matrix: