fix: Correct starlette TemplateResponse API signature in app.py

The TemplateResponse method in starlette 1.0.0 requires 'request' as the
first positional argument, not the template name. All frontend page routes
were using the wrong signature causing HTTP 500 errors.

Changed from:
  templates.TemplateResponse("template.html", {"request": request, "page": "xxx"})
To:
  templates.TemplateResponse(request, "template.html", {"page": "xxx"})

This fixes all frontend page rendering issues for /, /predict, /dashboard,
/protection, /train, /tutorial, /explanation and other frontend routes.

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

Author: zimingttkx

app.py

@@ -202,71 +202,67 @@ def training_task():
 
 # --- 页面路由 ---
 @app.get("/", tags=["Frontend"], response_class=HTMLResponse)
-async def serve_home(request: Request): return templates.TemplateResponse("index.html",
-                                                                          {"request": request, "page": "home"})
+async def serve_home(request: Request): return templates.TemplateResponse(request, "index.html",
+                                                                          {"page": "home"})
 
 
 @app.get("/dashboard", tags=["Frontend"], response_class=HTMLResponse)
 async def serve_dashboard(request: Request):
     """统计仪表盘页面"""
-    return templates.TemplateResponse("dashboard.html", {"request": request, "page": "dashboard"})
+    return templates.TemplateResponse(request, "dashboard.html", {"page": "dashboard"})
 
 
 @app.get("/training-console", tags=["Frontend"], response_class=HTMLResponse)
-async def serve_training_console(request: Request): return templates.TemplateResponse("training.html",
-                                                                                      {"request": request,
-                                                                                       "page": "training"})
+async def serve_training_console(request: Request): return templates.TemplateResponse(request, "training.html",
+                                                                                      {"page": "training"})
 
 
 @app.get("/pipeline-explorer", tags=["Frontend"], response_class=HTMLResponse)
-async def serve_pipeline_explorer(request: Request): return templates.TemplateResponse("pipeline.html",
-                                                                                       {"request": request,
-                                                                                        "page": "pipeline"})
+async def serve_pipeline_explorer(request: Request): return templates.TemplateResponse(request, "pipeline.html",
+                                                                                       {"page": "pipeline"})
 
 
 @app.get("/evaluation-report", tags=["Frontend"], response_class=HTMLResponse)
-async def serve_evaluation_report(request: Request): return templates.TemplateResponse("evaluation.html",
-                                                                                       {"request": request,
-                                                                                        "page": "evaluation"})
+async def serve_evaluation_report(request: Request): return templates.TemplateResponse(request, "evaluation.html",
+                                                                                       {"page": "evaluation"})
 
 
 @app.get("/live-inference", tags=["Frontend"], response_class=HTMLResponse)
-async def serve_live_inference(request: Request): return templates.TemplateResponse("predict.html", {"request": request,
-                                                                                                     "page": "predict"})
+async def serve_live_inference(request: Request): return templates.TemplateResponse(request, "predict.html", {"page": "predict"})
 
 
 # --- 新增的现代化页面路由 ---
 @app.get("/predict", tags=["Frontend"], response_class=HTMLResponse)
 async def serve_predict(request: Request):
-    return templates.TemplateResponse("predict.html", {"request": request, "page": "predict"})
+    return templates.TemplateResponse(request, "predict.html", {"page": "predict"})
 
 
 @app.get("/train", tags=["Frontend"], response_class=HTMLResponse)
 async def serve_train(request: Request):
-    return templates.TemplateResponse("training.html", {"request": request, "page": "training"})
+    return templates.TemplateResponse(request, "training.html", {"page": "training"})
 
 
 @app.get("/protection", tags=["Frontend"], response_class=HTMLResponse)
 async def serve_protection(request: Request):
     """一键保护页面"""
-    return templates.TemplateResponse("protection.html", {"request": request, "page": "protection"})
+    return templates.TemplateResponse(request, "protection.html", {"page": "protection"})
 
 
 @app.get("/model-select", tags=["Frontend"], response_class=HTMLResponse)
 async def serve_model_select(request: Request):
     """模型选择页面"""
-    return templates.TemplateResponse("model_select.html", {"request": request, "page": "model-select"})
+    return templates.TemplateResponse(request, "model_select.html", {"page": "model-select"})
 
 
 @app.get("/tutorial", tags=["Frontend"], response_class=HTMLResponse)
 async def serve_tutorial(request: Request):
-    return templates.TemplateResponse("tutorial.html", {"request": request, "page": "tutorial"})
+    return templates.TemplateResponse(request, "tutorial.html", {"page": "tutorial"})
 
 
 @app.get("/explanation", tags=["Frontend"], response_class=HTMLResponse)
 async def serve_explanation(request: Request):
     """模型解释页面"""
-    return templates.TemplateResponse("explanation.html", {"request": request, "page": "explanation"})
+    return templates.TemplateResponse(request, "explanation.html", {"page": "explanation"})
 
 
 # --- Pydantic 模型 ---