Implement image upload functionality with metadata storage; update frontend to display uploaded images

Co-authored-by: Copilot <copilot@github.com>

frontend/app/main.py

@@ -4,6 +4,7 @@ import functools
 import httpx
 from flask import (
     Flask,
+    Response,
     flash,
     jsonify,
     redirect,
@@ -121,11 +122,27 @@ def dashboard():
     token = session["access_token"]
     resp = _api("GET", "/users/me", token=token)
     user = resp.json() if resp.status_code == 200 else {}
-    return render_template("dashboard.html", user=user)
+    img_resp = _api("GET", "/images/", token=token)
+    images = img_resp.json() if img_resp.status_code == 200 else []
+    return render_template("dashboard.html", user=user, images=images)
 
 
 # ── Generate ──────────────────────────────────────────────────────────────
 
+@app.get("/images/<image_id>/file")
+@login_required
+def serve_uploaded_image(image_id: str):
+    resp = _api("GET", f"/images/{image_id}/file",
+                token=session["access_token"])
+    if resp.status_code != 200:
+        return Response("Not found", status=404)
+    return Response(
+        resp.content,
+        status=200,
+        content_type=resp.headers.get("content-type", "image/jpeg"),
+    )
+
+
 @app.get("/generate")
 @login_required
 def generate():
@@ -153,6 +170,19 @@ def generate_text():
 def generate_image():
     result = error = None
     if request.method == "POST":
+        # Upload reference image if provided
+        ref_file = request.files.get("reference_image")
+        if ref_file and ref_file.filename:
+            up_resp = _api(
+                "POST", "/images/upload",
+                token=session["access_token"],
+                files={"file": (ref_file.filename,
+                                ref_file.stream, ref_file.content_type)},
+            )
+            if up_resp.status_code not in (200, 201):
+                error = up_resp.json().get("detail", "Image upload failed.")
+                return render_template("generate_image.html", result=result, error=error)
+
         resp = _api("POST", "/generate/image", token=session["access_token"], json={
             "model": request.form.get("model", "").strip(),
             "prompt": request.form.get("prompt", "").strip(),