feat: enable S3 video uploads and update related configurations

- Added support for self-hosted S3 video uploads with new environment variables: OPENFRAME_ENABLE_S3_VIDEO_UPLOADS and OPENFRAME_MAX_VIDEO_UPLOAD_BYTES.
- Updated .env.example and .env.docker.example to reflect new configuration options.
- Enhanced Content Security Policy to include origins for S3-compatible storage.
- Updated dependencies for AWS SDK to support new features.
- Refactored upload logic to accommodate both Bunny and S3 upload providers.
- Updated documentation to clarify the usage of direct uploads and S3 configurations.
- Closes #11

lib/json-serialize.ts

@@ -0,0 +1,8 @@
+/**
+ * Converts values for JSON responses (e.g. Prisma BigInt fields).
+ */
+export function toJsonSafe<T>(value: T): T {
+  return JSON.parse(
+    JSON.stringify(value, (_key, val) => (typeof val === 'bigint' ? val.toString() : val))
+  ) as T;
+}