fix(ci): add tauri package.json to Dockerfiles and fix Android NDK/build issues

Build and Deploy: workspace has 4 members (api/web/shared/tauri) but
Dockerfiles only copied 3 package.json files. Missing tauri workspace
member caused bun install --production to fail with frozen lockfile
error.

Build Android APK:
- Remove explicit NDK 28 install (runner has NDK 29 pre-installed, dual
  NDK presence broke ANDROID_NDK_HOME resolution)
- Auto-pin NDK version from runner's SDK
- rm -rf gen/android before tauri android init (stale cache recovery)
- Remove gen/android/.gradle from Gradle cache (causes stale state)
- Use --apk flag for faster APK-only build

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

apps/api/Dockerfile

@@ -4,6 +4,7 @@ WORKDIR /app
 COPY package.json bun.lock bunfig.toml tsconfig.base.json ./
 COPY apps/api/package.json apps/api/package.json
 COPY apps/web/package.json apps/web/package.json
+COPY apps/tauri/package.json apps/tauri/package.json
 COPY packages/shared/package.json packages/shared/package.json
 RUN bun install --production
 

apps/web/Dockerfile

@@ -5,6 +5,7 @@ COPY package.json bun.lock bunfig.toml tsconfig.base.json ./
 COPY packages/shared/package.json packages/shared/package.json
 COPY apps/web/package.json apps/web/package.json
 COPY apps/api/package.json apps/api/package.json
+COPY apps/tauri/package.json apps/tauri/package.json
 RUN bun install
 
 COPY packages/shared packages/shared