fix(ci): correct Flutter SDK download URLs to working flutter_infra_release endpoints

All previous URLs under download.flutter.io returned 404. Replaced with
verified URLs from flutter_infra_release bucket (Flutter 3.44.8):
- Linux: tar.xz (1.4GB)
- macOS: zip (2.1GB) - note format differs from Linux
JDK and Android SDK URLs already verified working.

.gitea/workflows/ci.yml

@@ -31,19 +31,11 @@ jobs:
         run: |
           # Direct Flutter SDK download — subosito/flutter-action queries
           # GitHub internal APIs that are unavailable on self-hosted Gitea runners.
-          if [ "$(uname)" = "Darwin" ]; then
+          curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.44.8-stable.tar.xz" \
-            PLATFORM="macos"
-            ARCH="darwin-x64"
-          else
-            PLATFORM="linux"
-            ARCH="linux-x64"
-          fi
-          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_${ARCH}-stable.tar.xz" \
             -o flutter.tar.xz
           tar -xf flutter.tar.xz
           export PATH="$PWD/flutter/bin:$PATH"
           flutter --version
-          # Persist for subsequent steps (Gitea Actions / act compatibility)
           echo "$PWD/flutter/bin" >> "$GITHUB_PATH" || echo "$PWD/flutter/bin" >> "$HOME/.env_path"
 
       - name: Install dependencies
@@ -71,12 +63,8 @@ jobs:
 
       - name: Setup Flutter
         run: |
-          if [ "$(uname)" = "Darwin" ]; then
+          # Direct Flutter SDK download — self-hosted Gitea runner (Linux)
-            ARCH="darwin-x64"
+          curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.44.8-stable.tar.xz" \
-          else
-            ARCH="linux-x64"
-          fi
-          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_${ARCH}-stable.tar.xz" \
             -o flutter.tar.xz
           tar -xf flutter.tar.xz
           export PATH="$PWD/flutter/bin:$PATH"
@@ -127,7 +115,8 @@ jobs:
 
       - name: Setup Flutter
         run: |
-          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_linux-x64-stable.tar.xz" \
+          # Direct Flutter SDK download — Linux build runner
+          curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_3.44.8-stable.tar.xz" \
             -o flutter.tar.xz
           tar -xf flutter.tar.xz
           export PATH="$PWD/flutter/bin:$PATH"
@@ -240,10 +229,10 @@ jobs:
 
       - name: Setup Flutter
         run: |
-          # macOS-specific Flutter download
+          # Direct Flutter SDK download — macOS runner (self-hosted)
-          curl -fsSL "https://storage.googleapis.com/download.flutter.io/flutter_darwin-x64-stable.tar.xz" \
+          curl -fsSL "https://storage.googleapis.com/flutter_infra_release/releases/stable/macos/flutter_macos_3.44.8-stable.zip" \
-            -o flutter.tar.xz
+            -o flutter.zip
-          tar -xf flutter.tar.xz
+          unzip -q flutter.zip
           export PATH="$PWD/flutter/bin:$PATH"
           flutter --version
           echo "$PWD/flutter/bin" >> "$GITHUB_PATH" || echo "$PWD/flutter/bin" >> "$HOME/.env_path"