fix ui serving route and include index.html in image

Dockerfile

@@ -80,6 +80,7 @@ COPY --from=builder /install /install
 # Copy application source last — maximises cache reuse for code iterations.
 # Only the files the server actually needs at runtime:
 COPY main.py        ./main.py
+COPY index.html     ./index.html
 COPY inference.py    ./inference.py
 COPY train.py        ./train.py
 COPY openenv.yaml   ./openenv.yaml

main.py

@@ -29,12 +29,14 @@ from __future__ import annotations
 import math
 import random
 import uuid
+from pathlib import Path
 from dataclasses import dataclass, field
 from enum import IntEnum
 from typing import Any
 
 import uvicorn
 from fastapi import FastAPI, HTTPException
+from fastapi.responses import FileResponse
 from pydantic import BaseModel, Field, field_validator
 
 # =============================================================================
@@ -1414,6 +1416,16 @@ app = FastAPI(
     version="1.0.0",
 )
 
+_INDEX_HTML_PATH = Path(__file__).resolve().parent / "index.html"
+
+
+@app.get("/", include_in_schema=False)
+def ui() -> FileResponse:
+    """Serve the dashboard UI from the repository root."""
+    if not _INDEX_HTML_PATH.exists():
+        raise HTTPException(404, "index.html not found in application directory.")
+    return FileResponse(_INDEX_HTML_PATH)
+
 
 # Action schema is identical across all tasks — defined once, attached to every TaskMeta.
 # Describes every field in the Action model: type, bounds, and semantics.