proto: add RecordSpeedTest RPC + request/response messages

proto/stats.proto

@@ -14,6 +14,9 @@ service SpeedStatus {
   // Auth: Bearer JWT (HS256) в gRPC metadata "authorization: Bearer <jwt>".
   // Server validates: signature, exp, scope=="tunnel", optional revocation list.
   rpc Tunnel(stream Frame) returns (stream Frame);
+
+  // RecordSpeedTest ingests a single speedtest sample from an edge node.
+  rpc RecordSpeedTest(RecordSpeedTestRequest) returns (RecordSpeedTestResponse);
 }
 
 message Filter {
@@ -60,3 +63,25 @@ message Frame {
   bytes payload = 3;     // raw TCP bytes
   bytes padding = 4;     // random padding для frame-length obfuscation
 }
+
+message RecordSpeedTestRequest {
+  // Unix epoch seconds. Required.
+  int64 timestamp = 1;
+  // Node identifier: "fl" or "pl1". Required.
+  string node = 2;
+  // ISO-2 country code resolved from client IP at the edge node. "XX" if unknown.
+  string country = 3;
+  // Mbps. >= 0.
+  double dl_mbps = 4;
+  // Mbps. >= 0.
+  double ul_mbps = 5;
+  // Milliseconds. >= 0.
+  double ping_ms = 6;
+  // Milliseconds. >= 0.
+  double jitter_ms = 7;
+}
+
+message RecordSpeedTestResponse {
+  // Server-assigned monotonic ID for the inserted row.
+  int64 id = 1;
+}