fix(parallel_ai): register the extract route with the gateway allowlist and types

Three CI failures from adding the route:

- test_gateway_plus_backend_covers_full_app requires every app route to be
  exposed by a component; /parallel_ai/ joins the pass-through prefixes.
- The route appears in the proxy OpenAPI spec, so the dashboard types gain the
  path and its operation.
- tests/.../parallel_ai/extract/ had no __init__.py while its parent package
  does, so pytest named the module by basename alone and it collided with
  fal_ai/test_cost_calculator.py.

gateway/routes/allowlist.py

@@ -94,6 +94,7 @@ GATEWAY_PATH_PREFIXES: tuple[str, ...] = (
     "/langfuse/",
     "/vllm/",
     "/mistral/",
+    "/parallel_ai/",
     "/groq/",
     "/voyage/",
     "/cursor/",

ui/litellm-dashboard/src/lib/http/schema.d.ts

@@ -9842,6 +9842,23 @@ export interface paths {
         patch?: never;
         trace?: never;
     };
+    "/parallel_ai/v1/extract": {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        get?: never;
+        put?: never;
+        /** Parallel Ai Extract Proxy Route */
+        post: operations["parallel_ai_extract_proxy_route_parallel_ai_v1_extract_post"];
+        delete?: never;
+        options?: never;
+        head?: never;
+        patch?: never;
+        trace?: never;
+    };
     "/plugin-proxy/{plugin_name}/{path}": {
         parameters: {
             query?: never;
@@ -49691,6 +49708,26 @@ export interface operations {
             };
         };
     };
+    parallel_ai_extract_proxy_route_parallel_ai_v1_extract_post: {
+        parameters: {
+            query?: never;
+            header?: never;
+            path?: never;
+            cookie?: never;
+        };
+        requestBody?: never;
+        responses: {
+            /** @description Successful Response */
+            200: {
+                headers: {
+                    [name: string]: unknown;
+                };
+                content: {
+                    "application/json": unknown;
+                };
+            };
+        };
+    };
     plugin_proxy_plugin_proxy__plugin_name___path__get: {
         parameters: {
             query?: never;