chore(server): update backend configuration files

- pyproject.toml: update project dependencies and metadata
- config.py: update application configuration settings
- openapi.py: update OpenAPI documentation

server/src/app/core/config.py

@@ -67,6 +67,18 @@ class Settings(BaseSettings):
     log_dir: str = Field(default="logs", alias="LOG_DIR")
     log_file_enabled: bool = Field(default=True, alias="LOG_FILE_ENABLED")
     storage_root_dir: str = Field(default="storage", alias="STORAGE_ROOT_DIR")
+    ocr_python_bin: str = Field(default="", alias="OCR_PYTHON_BIN")
+    ocr_timeout_seconds: int = Field(default=180, alias="OCR_TIMEOUT_SECONDS")
+    ocr_max_file_size_mb: int = Field(default=20, alias="OCR_MAX_FILE_SIZE_MB")
+    ocr_language: str = Field(default="ch", alias="OCR_LANGUAGE")
+    ocr_text_detection_model: str = Field(
+        default="PP-OCRv5_mobile_det",
+        alias="OCR_TEXT_DETECTION_MODEL",
+    )
+    ocr_text_recognition_model: str = Field(
+        default="PP-OCRv5_mobile_rec",
+        alias="OCR_TEXT_RECOGNITION_MODEL",
+    )
 
     @property
     def resolved_database_url(self) -> str:
@@ -85,6 +97,10 @@ class Settings(BaseSettings):
             path = SERVER_DIR / path
         return path.resolve()
 
+    @property
+    def resolved_ocr_temp_dir(self) -> Path:
+        return (self.resolved_storage_root_dir / "ocr_temp").resolve()
+
 def _resolve_env_files() -> tuple[Path, ...]:
     env_files = Settings.model_config.get("env_file") or ()
     return tuple(Path(item) for item in env_files)

server/src/app/core/openapi.py

@@ -27,6 +27,7 @@ X-Financial 后端 OpenAPI 文档。
 - 员工目录
 - 报销单
 - 知识库与 ONLYOFFICE
+- OCR 票据识别
 - 语义本体解析
 - Orchestrator 统一调度
 - 系统设置与模型连通性
@@ -59,6 +60,10 @@ OPENAPI_TAGS = [
         "name": "knowledge",
         "description": "知识库文件管理、内容访问与 ONLYOFFICE 集成接口。",
     },
+    {
+        "name": "ocr",
+        "description": "票据图片与 PDF 的 OCR 识别接口，当前默认对接 PaddleOCR mobile 运行时。",
+    },
     {
         "name": "ontology",
         "description": "Day 3 语义本体解析接口，把自然语言问题稳定转换为 8 个核心字段。",