refactor: rename canto-backend → backend, canto-frontend → frontend

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/config.py

@@ -0,0 +1,74 @@
+import os
+from pathlib import Path
+from typing import Optional
+from pydantic_settings import BaseSettings
+from pydantic import Field, field_validator
+
+class Settings(BaseSettings):
+    SECRET_KEY: str = Field(default="your-secret-key-change-this-in-production")
+    ALGORITHM: str = Field(default="HS256")
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = Field(default=30)
+
+    DATABASE_URL: str = Field(default="sqlite:///./qwen_tts.db")
+    CACHE_DIR: str = Field(default="./voice_cache")
+    OUTPUT_DIR: str = Field(default="./outputs")
+    BASE_URL: str = Field(default="")
+
+    MODEL_DEVICE: str = Field(default="cuda:0")
+    MODEL_BASE_PATH: str = Field(default="../Qwen")
+
+    MAX_CACHE_ENTRIES: int = Field(default=100)
+    CACHE_TTL_DAYS: int = Field(default=7)
+
+    HOST: str = Field(default="0.0.0.0")
+    PORT: int = Field(default=8000)
+    WORKERS: int = Field(default=1)
+    LOG_LEVEL: str = Field(default="info")
+    LOG_FILE: str = Field(default="./app.log")
+    DEV_MODE: bool = Field(default=False)
+
+    RATE_LIMIT_PER_MINUTE: int = Field(default=50)
+    RATE_LIMIT_PER_HOUR: int = Field(default=1000)
+
+    MAX_QUEUE_SIZE: int = Field(default=100)
+    BATCH_SIZE: int = Field(default=4)
+    BATCH_WAIT_TIME: float = Field(default=0.5)
+
+    MAX_TEXT_LENGTH: int = Field(default=1000)
+    MAX_AUDIO_SIZE_MB: int = Field(default=10)
+
+    DEFAULT_BACKEND: str = Field(default="local")
+
+    AUDIOBOOK_PARSE_CONCURRENCY: int = Field(default=3)
+    AUDIOBOOK_GENERATE_CONCURRENCY: int = Field(default=2)
+
+    class Config:
+        env_file = ".env"
+        case_sensitive = True
+
+    @field_validator('MODEL_BASE_PATH')
+    @classmethod
+    def validate_model_path(cls, v: str) -> str:
+        path = Path(v)
+        if not path.exists():
+            raise ValueError(f"Model base path does not exist: {v}")
+        return v
+
+    def validate(self):
+        if self.DEV_MODE:
+            import warnings
+            warnings.warn("DEV_MODE is enabled — authentication is bypassed. Do NOT use in production.")
+        elif self.SECRET_KEY == "your-secret-key-change-this-in-production":
+            raise ValueError("Insecure default SECRET_KEY is not allowed. Please set a strong SECRET_KEY in environment.")
+
+        Path(self.CACHE_DIR).mkdir(parents=True, exist_ok=True)
+        Path(self.OUTPUT_DIR).mkdir(parents=True, exist_ok=True)
+
+        if self.WORKERS > 1:
+            import warnings
+            warnings.warn("WORKERS > 1 not recommended for GPU models. Setting to 1.")
+            self.WORKERS = 1
+
+        return True
+
+settings = Settings()