ci: CI-gate gitleaks (scan secrets au push)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitea/workflows/gitleaks.yml

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+name: Gitleaks (secret scan)
+on:
+  push:
+    branches: [main]
+  workflow_dispatch: {}
+jobs:
+  gitleaks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Secret scan (gitleaks)
+        run: |
+          set -e
+          curl -fsSL https://github.com/gitleaks/gitleaks/releases/download/v8.18.4/gitleaks_8.18.4_linux_x64.tar.gz | tar xz gitleaks
+          ./gitleaks detect --source . -c .gitleaks.toml --no-git --redact --no-banner --exit-code 1
+          echo "✓ aucun secret détecté"

.gitleaks.toml

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+title = "homelab"
+[extend]
+useDefault = true
+[[rules]]
+id = "groq-key"
+description = "Groq API key"
+regex = '''gsk_[A-Za-z0-9]{20,}'''
+[[rules]]
+id = "plane-key"
+description = "Plane API key"
+regex = '''plane_api_[A-Za-z0-9]{10,}'''
+[[rules]]
+id = "vault-token"
+description = "Vault token"
+regex = '''hvs\.[A-Za-z0-9_-]{15,}'''
+[[rules]]
+id = "hex40-token-ctx"
+description = "40-hex token in credential context (Gitea etc.)"
+regex = '''(?i)(?:tok|token|secret|key|auth|bearer|pass|pwd)['"=: ]{0,12}([a-f0-9]{40})'''
+[allowlist]
+description = "vendored / lock / build artifacts"
+paths = [
+  '''.*\.min\.(js|css)$''',
+  '''.*-lock\.json$''',
+  '''.*\.lock$''',
+  '''(^|/)(vendor|dist|node_modules|build|three\.min|mermaid\.min)''',
+]