feat: Add API endpoint to get current NormalSub subpath

- Created `GetSubPathResponse` Pydantic schema for the API response.
- Added a new GET endpoint `/api/v1/config/normalsub/subpath` to fetch
  the current NormalSub subpath using `cli_api.get_normalsub_subpath()`.
- Returns the subpath or null if not found/set.

core/scripts/webpanel/routers/api/v1/config/normalsub.py

@@ -1,6 +1,6 @@
 from fastapi import APIRouter, HTTPException
 from ..schema.response import DetailResponse
-from ..schema.config.normalsub import StartInputBody, EditSubPathInputBody
+from ..schema.config.normalsub import StartInputBody, EditSubPathInputBody, GetSubPathResponse
 import cli_api
 
 router = APIRouter()
@@ -74,4 +74,15 @@ async def normal_sub_edit_subpath_api(body: EditSubPathInputBody):
     except cli_api.InvalidInputError as e:
         raise HTTPException(status_code=422, detail=f'Validation Error: {str(e)}')
     except Exception as e:
-        raise HTTPException(status_code=400, detail=f'Error: {str(e)}')
+        raise HTTPException(status_code=400, detail=f'Error: {str(e)}')
+
+@router.get('/subpath', response_model=GetSubPathResponse, summary='Get Current NormalSub Subpath')
+async def normal_sub_get_subpath_api():
+    """
+    Retrieves the current subpath for the NormalSub service.
+    """
+    try:
+        current_subpath = cli_api.get_normalsub_subpath()
+        return GetSubPathResponse(subpath=current_subpath)
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f'Error retrieving subpath: {str(e)}')

core/scripts/webpanel/routers/api/v1/schema/config/normalsub.py

@@ -1,8 +1,12 @@
 from pydantic import BaseModel, Field
+from typing import Optional
 
 class StartInputBody(BaseModel):
     domain: str
     port: int
 
 class EditSubPathInputBody(BaseModel):
-    subpath: str = Field(..., min_length=1, pattern=r"^[a-zA-Z0-9]+$", description="The new subpath, must be alphanumeric.")
+    subpath: str = Field(..., min_length=1, pattern=r"^[a-zA-Z0-9]+$", description="The new subpath, must be alphanumeric.")
+
+class GetSubPathResponse(BaseModel):
+    subpath: Optional[str] = Field(None, description="The current NormalSub subpath, or null if not set/found.")