feat: Updated brand to be vantage

proto/vantage/v1/vantage.proto

@@ -0,0 +1,92 @@
+syntax = "proto3";
+
+package vantage.v1;
+
+option go_package = "github.com/mrhid6/vantage/server/internal/grpc/pb";
+
+service Vantage {
+  rpc Register(RegisterRequest)                returns (RegisterResponse);
+  rpc SyncKeys(SyncRequest)                    returns (SyncResponse);
+  rpc UploadGeneratedKey(UploadKeyRequest)      returns (UploadKeyResponse);
+  // Bidirectional stream: agent sends auth once, server pushes commands.
+  rpc CommandStream(stream AgentMessage)        returns (stream ServerCommand);
+}
+
+message RegisterRequest {
+  string server_id     = 1;
+  string pre_reg_token = 2;
+  string hostname      = 3;
+  string ip_address    = 4;
+  string os_info       = 5;
+}
+
+message RegisterResponse {
+  string agent_token = 1;
+}
+
+message SyncRequest {
+  string server_id    = 1;
+  string agent_token  = 2;
+  string agent_version = 3;
+}
+
+message SyncResponse {
+  repeated string public_keys = 1;
+}
+
+message UploadKeyRequest {
+  string server_id   = 1;
+  string agent_token = 2;
+  string public_key  = 3;
+  string label       = 4;
+  string private_key = 5;
+}
+
+message UploadKeyResponse {
+  string key_id = 1;
+}
+
+// CommandStream messages
+
+message AgentMessage {
+  string server_id   = 1;
+  string agent_token = 2;
+  oneof payload {
+    AgentReady    ready  = 3;
+    CommandResult result = 4;
+  }
+}
+
+message AgentReady {}
+
+message CommandResult {
+  string command_id = 1;
+  bool   success    = 2;
+  string message    = 3;
+}
+
+message ServerCommand {
+  string command_id = 1;
+  oneof command {
+    GenerateKeyCmd generate_key = 2;
+    DeleteKeyCmd   delete_key   = 3;
+    UpdateAgentCmd update_agent = 4;
+  }
+}
+
+message DeleteKeyCmd {
+  string label = 1;
+}
+
+message UpdateAgentCmd {
+  string version       = 1; // e.g. "1.2.3"
+  string gitea_base_url = 2; // e.g. "https://gitea.example.com"
+}
+
+message GenerateKeyCmd {
+  string label      = 1;
+  string key_type   = 2; // ed25519 | rsa | ecdsa (default: ed25519)
+  int32  key_size   = 3; // bits; used for rsa and ecdsa
+  string passphrase = 4; // empty = no passphrase
+  string comment    = 5; // embedded in public key
+}