feat: Extract hardcoded configs to environment variables

- Add environment variable configuration for backend and frontend
- Backend: DB_POOL_SIZE, JWT_EXPIRE_HOURS, timeout configs, directory paths
- Frontend: VITE_API_BASE_URL, VITE_UPLOAD_TIMEOUT, Whisper configs
- Create deployment script (scripts/deploy-backend.sh)
- Create 1Panel deployment guide (docs/1panel-deployment.md)
- Update DEPLOYMENT.md with env var documentation
- Create README.md with project overview
- Remove obsolete PRD.md, SDD.md, TDD.md (replaced by OpenSpec)
- Keep CORS allow_origins=["*"] for Electron EXE distribution

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

start.sh

@@ -19,13 +19,25 @@ BACKEND_DIR="$PROJECT_DIR/backend"
 CLIENT_DIR="$PROJECT_DIR/client"
 SIDECAR_DIR="$PROJECT_DIR/sidecar"
 
-# Port 設定
-BACKEND_PORT=8000
+# Load environment variables from .env files if they exist
+if [ -f "$BACKEND_DIR/.env" ]; then
+    log_info "Loading backend environment from $BACKEND_DIR/.env"
+    export $(grep -v '^#' "$BACKEND_DIR/.env" | grep -v '^$' | xargs)
+fi
 
-# Whisper 語音轉文字設定
-export WHISPER_MODEL="medium"      # 模型大小: tiny, base, small, medium, large
-export WHISPER_DEVICE="cpu"        # 執行裝置: cpu, cuda
-export WHISPER_COMPUTE="int8"      # 運算精度: int8, float16, float32
+if [ -f "$CLIENT_DIR/.env" ]; then
+    log_info "Loading client environment from $CLIENT_DIR/.env"
+    export $(grep -v '^#' "$CLIENT_DIR/.env" | grep -v '^$' | xargs)
+fi
+
+# Server Configuration (can be overridden by .env)
+BACKEND_HOST="${BACKEND_HOST:-0.0.0.0}"
+BACKEND_PORT="${BACKEND_PORT:-8000}"
+
+# Whisper Configuration (can be overridden by .env)
+export WHISPER_MODEL="${WHISPER_MODEL:-medium}"      # 模型大小: tiny, base, small, medium, large
+export WHISPER_DEVICE="${WHISPER_DEVICE:-cpu}"       # 執行裝置: cpu, cuda
+export WHISPER_COMPUTE="${WHISPER_COMPUTE:-int8}"    # 運算精度: int8, float16, float32
 
 # PID 檔案
 PID_FILE="$PROJECT_DIR/.running_pids"