Split CI workflows into per-OS files for independent re-runs

Refactored from 2 monolithic workflows into 8 targeted ones:

Coordinators (version bump + tag + release creation):
- release.yml: bumps app version, tags v*, creates Gitea release
- sidecar-release.yml: bumps sidecar version, tags sidecar-v*

Per-OS app builds (triggered by v* tags or workflow_dispatch):
- build-app-linux.yml: .deb, .rpm, .AppImage
- build-app-windows.yml: .msi, -setup.exe
- build-app-macos.yml: .dmg

Per-OS sidecar builds (triggered by sidecar-v* tags or workflow_dispatch):
- build-sidecar-linux.yml: CUDA + CPU variants
- build-sidecar-windows.yml: CUDA + CPU variants
- build-sidecar-macos.yml: CPU only

Each build workflow can be re-triggered independently without
re-running the version bump or rebuilding other platforms.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-app-macos.yml

@@ -0,0 +1,104 @@
+name: Build App (macOS)
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Release tag to build (e.g. v1.4.5)'
+        required: false
+
+jobs:
+  build-macos:
+    name: Build App (macOS)
+    runs-on: macos-latest
+    env:
+      NODE_VERSION: "20"
+    steps:
+      - name: Determine tag
+        id: tag
+        run: |
+          if [ -n "${{ github.event.inputs.tag }}" ]; then
+            TAG="${{ github.event.inputs.tag }}"
+          elif [[ "${{ github.ref }}" == refs/tags/* ]]; then
+            TAG="${{ github.ref_name }}"
+          else
+            TAG=$(git ls-remote --tags --sort=-v:refname origin 'refs/tags/v*' | head -1 | sed 's|.*refs/tags/||')
+          fi
+          echo "Building for tag: ${TAG}"
+          echo "tag=${TAG}" >> $GITHUB_OUTPUT
+
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ steps.tag.outputs.tag }}
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ env.NODE_VERSION }}
+
+      - name: Install Rust stable
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+
+      - name: Install system dependencies
+        run: brew install --quiet create-dmg || true
+
+      - name: Install npm dependencies
+        run: npm ci
+
+      - name: Build Tauri app
+        run: npm run tauri build
+
+      - name: Upload to release
+        env:
+          BUILD_TOKEN: ${{ secrets.BUILD_TOKEN }}
+        run: |
+          which jq || brew install jq
+          REPO_API="${GITHUB_SERVER_URL}/api/v1/repos/${GITHUB_REPOSITORY}"
+          TAG="${{ steps.tag.outputs.tag }}"
+          echo "Release tag: ${TAG}"
+
+          echo "Waiting for release ${TAG} to be available..."
+          RELEASE_ID=""
+          for i in $(seq 1 30); do
+            RELEASE_JSON=$(curl -s -H "Authorization: token ${BUILD_TOKEN}" \
+              "${REPO_API}/releases/tags/${TAG}")
+            RELEASE_ID=$(echo "$RELEASE_JSON" | jq -r '.id // empty')
+
+            if [ -n "${RELEASE_ID}" ] && [ "${RELEASE_ID}" != "null" ]; then
+              echo "Found release: ${TAG} (ID: ${RELEASE_ID})"
+              break
+            fi
+
+            echo "Attempt ${i}/30: Release not ready yet, retrying in 10s..."
+            sleep 10
+          done
+
+          if [ -z "${RELEASE_ID}" ] || [ "${RELEASE_ID}" = "null" ]; then
+            echo "ERROR: Failed to find release for tag ${TAG} after 30 attempts."
+            exit 1
+          fi
+
+          find src-tauri/target/release/bundle -type f -name "*.dmg" | while IFS= read -r file; do
+            filename=$(basename "$file")
+            encoded_name=$(echo "$filename" | sed 's/ /%20/g')
+            echo "Uploading ${filename} ($(du -h "$file" | cut -f1))..."
+
+            ASSET_ID=$(curl -s -H "Authorization: token ${BUILD_TOKEN}" \
+              "${REPO_API}/releases/${RELEASE_ID}/assets" | jq -r ".[] | select(.name == \"${filename}\") | .id // empty")
+            if [ -n "${ASSET_ID}" ]; then
+              curl -s -X DELETE -H "Authorization: token ${BUILD_TOKEN}" \
+                "${REPO_API}/releases/${RELEASE_ID}/assets/${ASSET_ID}"
+            fi
+
+            HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" -X POST \
+              -H "Authorization: token ${BUILD_TOKEN}" \
+              -H "Content-Type: application/octet-stream" \
+              -T "$file" \
+              "${REPO_API}/releases/${RELEASE_ID}/assets?name=${encoded_name}")
+            echo "Upload response: HTTP ${HTTP_CODE}"
+          done