Add Gitea OTA firmware update, dual-slot partition layout, and Gitea Actions release workflow

.gitea/workflows/releases.yml

@@ -0,0 +1,57 @@
+name: Build & Release Firmware
+
+on:
+  push:
+    tags:
+      - 'v*'
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build ESP32 Firmware
+    runs-on: ubuntu-latest
+    container:
+      image: espressif/idf:v5.5
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Compile ESP32 firmware
+        shell: bash
+        run: |
+          . $IDF_PATH/export.sh
+          idf.py build
+
+      - name: Bundle release artifacts
+        shell: bash
+        run: |
+          mkdir -p release-dist
+          # Primary OTA binary required by on-device update manager:
+          cp build/mtg-rfid-companion.bin release-dist/
+          # USB flashing bundle:
+          cp build/bootloader/bootloader.bin release-dist/
+          cp build/partition_table/partition-table.bin release-dist/
+          cp build/storage.bin release-dist/
+          cd release-dist
+          tar -czvf full-flash-bundle-${{ gitea.ref_name || 'latest' }}.tar.gz *.bin
+          cd ..
+
+      - name: Publish to Gitea Release
+        uses: https://gitea.com/actions/release-action@v1
+        continue-on-error: true
+        with:
+          files: |
+            release-dist/mtg-rfid-companion.bin
+            release-dist/full-flash-bundle-${{ gitea.ref_name || 'latest' }}.tar.gz
+          name: "Release ${{ gitea.ref_name }}"
+          draft: false
+          prerelease: false
+          api_key: ${{ secrets.RELEASE_TOKEN || gitea.token }}
+
+      - name: Upload Artifacts to Workflow
+        uses: actions/upload-artifact@v4
+        with:
+          name: mtg-firmware-${{ gitea.ref_name || 'manual' }}
+          path: release-dist/*