- Replaced legacy DTLS transport details with gRPC/HTTP2 tunnel architecture.
- Updated server and client roles to describe gRPC bi-directional stream-based request/response handling.
- Revised internal component descriptions and flow diagrams to align with gRPC-based implementation.
- Marked DTLS sections as deprecated and documented planned removal in future versions.
- Designed a stream/frame-based protocol leveraging `StreamOpen`, `StreamData`, and `StreamClose` fields for chunked transmission.
- Addressed DTLS/UDP MTU limits by capping tunneled body sizes to 48 KiB and replacing oversized responses with `502 Bad Gateway`.
- Updated `internal/protocol` to enable safe handling of large HTTP bodies via streaming.
- Documented future work on replacing JSON with binary encoding for improved performance.
