refactor!: migrate from REST API to GraphQL

- Replace OpenAPI/REST endpoints with a single  route.
- Remove  and Swagger UI configuration.
- Disable OpenAPI schema extensions in Zod types.
- Refactor  to be request-agnostic.
- Update episode URL fetching to return standardized success/failure objects.
- Update project dependencies.

src/graphql/context.ts

@@ -0,0 +1,22 @@
+import type { Context as HonoContext } from "hono";
+
+export interface GraphQLContext {
+  db: D1Database;
+  env: Env;
+  deviceId?: string;
+  aniListToken?: string;
+  honoContext: HonoContext;
+}
+
+export function createGraphQLContext(c: HonoContext): GraphQLContext {
+  const deviceId = c.req.header("X-Device-ID");
+  const aniListToken = c.req.header("X-AniList-Token");
+
+  return {
+    db: c.env.DB,
+    env: c.env,
+    deviceId,
+    aniListToken,
+    honoContext: c,
+  };
+}