feat(fxt): add ratatui/crossterm deps and ApproveModel/RejectModel proto RPCs

- ratatui 0.29, crossterm 0.28 (event-stream), tokio-stream to deps
- ApproveModel + RejectModel RPCs added to MLTrainingService
- 4 new proto messages for model promotion workflow

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

bin/fxt/Cargo.toml

@@ -28,7 +28,7 @@ prost.workspace = true  # Required for generated protobuf code
 
 # Core async and serialization (essential)
 tokio.workspace = true
-# tokio-stream.workspace = true  # REMOVED: unused in TLI source
+tokio-stream.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 # futures.workspace = true  # REMOVED: unused in TLI - only futures-util is used
@@ -75,6 +75,10 @@ comfy-table = "7.1"  # Rich ASCII tables
 indicatif = "0.17"  # Progress bars (for future use)
 console = "0.15"  # Terminal utilities
 
+# Terminal UI dashboard
+ratatui = "0.29"
+crossterm = { version = "0.28", features = ["event-stream"] }
+
 # Configuration file support
 toml = "0.8"  # TOML parsing for config files
 dirs = "5.0"  # Cross-platform directory access

bin/fxt/proto/ml_training.proto

@@ -45,6 +45,10 @@ service MLTrainingService {
 
   // Stream real-time tuning progress updates (trial completion events)
   rpc StreamTuningProgress(StreamProgressRequest) returns (stream ProgressUpdate);
+
+  // Model promotion management
+  rpc ApproveModel(ApproveModelRequest) returns (ApproveModelResponse);
+  rpc RejectModel(RejectModelRequest) returns (RejectModelResponse);
 }
 
 // --- Core Request/Response Messages ---
@@ -426,4 +430,25 @@ message ResourceUsage {
   float gpu_usage_percent = 3;
   float gpu_memory_usage_gb = 4;
   uint32 active_workers = 5;
+}
+
+// Model promotion messages
+message ApproveModelRequest {
+  string model_id = 1;
+  string promoted_to = 2;  // e.g. "production", "staging", "canary"
+}
+
+message ApproveModelResponse {
+  bool success = 1;
+  string message = 2;
+}
+
+message RejectModelRequest {
+  string model_id = 1;
+  string reason = 2;
+}
+
+message RejectModelResponse {
+  bool success = 1;
+  string message = 2;
 }