fix: Docker image size and add download retry mechanism

## Bug Fixes
- Fix standard image size issue (was ~1.5GB, should be 8-12GB)
- Add strict model validation during build
- Add retry mechanism (--retry 3 --retry-delay 5) to all curl downloads

## Documentation
- Clarify version terminology: Standard (一般版), Extended (擴充版), Lite (Lite版)
- Remove duplicate docs/環境變數總覽.md
- Improve environment variable documentation structure
- Add quick reference tables for environment variables

## Build
- Explicitly specify 'file: Dockerfile' in release.yml
- Use 'buildcache-full' cache key to prevent cross-pollution

package.json

@@ -1,6 +1,6 @@
 {
   "name": "convertx-frontend",
-  "version": "0.1.14",
+  "version": "0.1.16",
   "scripts": {
     "dev": "bun run --watch src/index.tsx",
     "hot": "bun run --hot src/index.tsx",