feat: create route to fetch stream URL from provider

Summary:

Test Plan:

src/controllers/episodes/getEpisodeUrl/index.ts

@@ -0,0 +1,85 @@
+import { OpenAPIHono, createRoute, z } from "@hono/zod-openapi";
+
+import type { Env } from "~/types/env";
+import {
+  ErrorResponse,
+  ErrorResponseSchema,
+  SuccessResponseSchema,
+} from "~/types/schema";
+
+import { getSourcesFromAnify } from "./anify";
+import { FetchUrlResponse as FetchUrlResponseSchema } from "./responseType";
+
+const FetchUrlRequest = z.object({ id: z.string(), provider: z.string() });
+
+const FetchUrlResponse = SuccessResponseSchema(FetchUrlResponseSchema);
+
+const route = createRoute({
+  tags: ["aniplay", "episodes"],
+  summary: "Fetch stream URL for an episode",
+  operationId: "fetchStreamUrl",
+  method: "post",
+  path: "/{aniListId}/url",
+  request: {
+    body: {
+      content: {
+        "application/json": {
+          schema: FetchUrlRequest,
+        },
+      },
+    },
+  },
+  responses: {
+    200: {
+      content: {
+        "application/json": {
+          schema: FetchUrlResponse,
+        },
+      },
+      description: "Returns a stream URL",
+    },
+    404: {
+      content: {
+        "application/json": {
+          schema: ErrorResponseSchema,
+        },
+      },
+      description: "Provider did not return a source",
+    },
+    500: {
+      content: {
+        "application/json": {
+          schema: ErrorResponseSchema,
+        },
+      },
+      description: "Failed to fetch stream URL from provider",
+    },
+  },
+});
+
+const app = new OpenAPIHono<Env>();
+
+app.openapi(route, async (c) => {
+  const aniListId = Number(c.req.param("aniListId"));
+  const { provider, id } = await c.req.json<typeof FetchUrlRequest._type>();
+
+  if (provider === "anify") {
+    try {
+      const result = await getSourcesFromAnify(provider, id, aniListId);
+      if (!result) {
+        return c.json({ success: false }, { status: 404 });
+      }
+
+      return c.json({
+        success: true,
+        result,
+      });
+    } catch (e) {
+      console.error("Failed to fetch download URL from Anify", e);
+
+      return c.json(ErrorResponse, { status: 500 });
+    }
+  }
+});
+
+export default app;