Add regex-based path preprocessing for playlist sync

app/main.py

@@ -125,6 +125,7 @@ def _build_home_context(
         "message": message,
         "message_type": message_type,
         "sync_result": sync_result,
+        "path_rules": server_config.path_rules,
     }
 
 
@@ -191,6 +192,35 @@ async def trigger_sync(request: Request, mode: str = Form(...), local_path: str
         return templates.TemplateResponse("home.html", context)
 
 
+@app.post("/path-rules", response_class=HTMLResponse)
+async def save_path_rules(
+    request: Request,
+    local_path: str = Form("playlist"),
+    pattern: list[str] | None = Form(None),
+    replacement: list[str] | None = Form(None),
+):
+    patterns = pattern or []
+    replacements = replacement or []
+
+    cleaned_rules: list[dict[str, str]] = []
+    for pat, repl in zip(patterns, replacements):
+        pat = pat.strip()
+        if not pat:
+            continue
+        cleaned_rules.append({"pattern": pat, "replacement": repl or ""})
+
+    server_config.set_and_save_config(path_rules=cleaned_rules)
+
+    context = _build_home_context(
+        request,
+        local_path,
+        message="正则规则已保存并会在同步前应用。",
+        message_type="success",
+    )
+
+    return templates.TemplateResponse("home.html", context)
+
+
 # 登录页面和处理
 @app.get("/login", response_class=HTMLResponse)
 async def login_page(request: Request):