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>

backend/app/config.py

@@ -5,12 +5,19 @@ load_dotenv()
 
 
 class Settings:
+    # Server Configuration
+    BACKEND_HOST: str = os.getenv("BACKEND_HOST", "0.0.0.0")
+    BACKEND_PORT: int = int(os.getenv("BACKEND_PORT", "8000"))
+
+    # Database Configuration
     DB_HOST: str = os.getenv("DB_HOST", "mysql.theaken.com")
     DB_PORT: int = int(os.getenv("DB_PORT", "33306"))
     DB_USER: str = os.getenv("DB_USER", "A060")
     DB_PASS: str = os.getenv("DB_PASS", "")
     DB_NAME: str = os.getenv("DB_NAME", "db_A060")
+    DB_POOL_SIZE: int = int(os.getenv("DB_POOL_SIZE", "5"))
 
+    # External API Configuration
     AUTH_API_URL: str = os.getenv(
         "AUTH_API_URL", "https://pj-auth-api.vercel.app/api/auth/login"
     )
@@ -18,8 +25,62 @@ class Settings:
     DIFY_API_KEY: str = os.getenv("DIFY_API_KEY", "")
     DIFY_STT_API_KEY: str = os.getenv("DIFY_STT_API_KEY", "")
 
+    # Authentication Configuration
     ADMIN_EMAIL: str = os.getenv("ADMIN_EMAIL", "ymirliu@panjit.com.tw")
     JWT_SECRET: str = os.getenv("JWT_SECRET", "meeting-assistant-secret")
+    JWT_EXPIRE_HOURS: int = int(os.getenv("JWT_EXPIRE_HOURS", "24"))
+
+    # Timeout Configuration (in milliseconds)
+    UPLOAD_TIMEOUT: int = int(os.getenv("UPLOAD_TIMEOUT", "600000"))  # 10 minutes
+    DIFY_STT_TIMEOUT: int = int(os.getenv("DIFY_STT_TIMEOUT", "300000"))  # 5 minutes
+    LLM_TIMEOUT: int = int(os.getenv("LLM_TIMEOUT", "120000"))  # 2 minutes
+    AUTH_TIMEOUT: int = int(os.getenv("AUTH_TIMEOUT", "30000"))  # 30 seconds
+
+    # File Configuration
+    TEMPLATE_DIR: str = os.getenv("TEMPLATE_DIR", "")
+    RECORD_DIR: str = os.getenv("RECORD_DIR", "")
+    MAX_FILE_SIZE: int = int(os.getenv("MAX_FILE_SIZE", str(500 * 1024 * 1024)))  # 500MB
+    SUPPORTED_AUDIO_FORMATS: str = os.getenv(
+        "SUPPORTED_AUDIO_FORMATS", ".mp3,.wav,.m4a,.webm,.ogg,.flac,.aac"
+    )
+
+    @property
+    def supported_audio_formats_set(self) -> set:
+        """Return supported audio formats as a set."""
+        return set(self.SUPPORTED_AUDIO_FORMATS.split(","))
+
+    def get_template_dir(self, base_dir: str) -> str:
+        """Get template directory path, resolving relative paths."""
+        if self.TEMPLATE_DIR:
+            if os.path.isabs(self.TEMPLATE_DIR):
+                return self.TEMPLATE_DIR
+            return os.path.join(base_dir, self.TEMPLATE_DIR)
+        return os.path.join(base_dir, "template")
+
+    def get_record_dir(self, base_dir: str) -> str:
+        """Get record directory path, resolving relative paths."""
+        if self.RECORD_DIR:
+            if os.path.isabs(self.RECORD_DIR):
+                return self.RECORD_DIR
+            return os.path.join(base_dir, self.RECORD_DIR)
+        return os.path.join(base_dir, "record")
+
+    # Timeout helpers (convert ms to seconds for httpx)
+    @property
+    def upload_timeout_seconds(self) -> float:
+        return self.UPLOAD_TIMEOUT / 1000.0
+
+    @property
+    def dify_stt_timeout_seconds(self) -> float:
+        return self.DIFY_STT_TIMEOUT / 1000.0
+
+    @property
+    def llm_timeout_seconds(self) -> float:
+        return self.LLM_TIMEOUT / 1000.0
+
+    @property
+    def auth_timeout_seconds(self) -> float:
+        return self.AUTH_TIMEOUT / 1000.0
 
 
 settings = Settings()