feat(ci): pipelines Gitea Actions CI + release multi-arch

- ci.yaml : cargo check + clippy (-D warnings) + fmt + tests sur push/PR main
- release.yaml : build cross (amd64/arm64/armv7) via cross-rs, création release
  Gitea avec binaires nommés par architecture sur tag v*
- ROADMAP Phase 5 marquée complète

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yaml

@@ -0,0 +1,61 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  check:
+    name: Vérification & lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Cache Cargo
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target/
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.toml') }}
+          restore-keys: ${{ runner.os }}-cargo-
+
+      - name: Installation Rust stable
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy, rustfmt
+
+      - name: Vérification compilation (cargo check)
+        run: cargo check --workspace
+
+      - name: Lint (cargo clippy)
+        run: cargo clippy --workspace -- -D warnings
+
+      - name: Format (cargo fmt)
+        run: cargo fmt --all -- --check
+
+  test:
+    name: Tests
+    runs-on: ubuntu-latest
+    needs: check
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target/
+          key: ${{ runner.os }}-cargo-test-${{ hashFiles('**/Cargo.toml') }}
+
+      - uses: dtolnay/rust-toolchain@stable
+
+      - name: Tests (cargo test)
+        run: cargo test --workspace
+        env:
+          DATABASE_URL: sqlite://:memory: