feat: multi-photo support in feedback (up to 5 screenshots)

iOS:
- PhotosPicker with maxSelectionCount: 5
- Horizontal scroll preview strip with individual remove buttons
- Sends "images" array instead of single "image"

Server:
- Gateway accepts both "image" (single, backwards compat) and
  "images" (array) fields
- Uploads each as separate Gitea issue attachment

Also closed Gitea issues #11, #12, #13, #14.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

gateway/feedback.py

@@ -100,33 +100,40 @@ def handle_feedback(handler, body, user):
         result = json.loads(resp.read())
         issue_number = result.get("number")
 
-        # Upload image attachment if provided
-        image_b64 = data.get("image")
-        if image_b64 and issue_number:
+        # Upload image attachments if provided
+        if issue_number:
             import base64
-            try:
-                img_bytes = base64.b64decode(image_b64)
-                boundary = "----FeedbackBoundary123"
-                body_parts = []
-                body_parts.append(f"--{boundary}\r\n".encode())
-                body_parts.append(b'Content-Disposition: form-data; name="attachment"; filename="screenshot.png"\r\n')
-                body_parts.append(b"Content-Type: image/png\r\n\r\n")
-                body_parts.append(img_bytes)
-                body_parts.append(f"\r\n--{boundary}--\r\n".encode())
-                multipart_body = b"".join(body_parts)
+            # Support single "image" or multiple "images" array
+            images_b64 = data.get("images", [])
+            single_image = data.get("image")
+            if single_image:
+                images_b64.insert(0, single_image)
 
-                img_req = urllib.request.Request(
-                    f"{GITEA_URL}/api/v1/repos/{REPO}/issues/{issue_number}/assets",
-                    data=multipart_body,
-                    headers={
-                        "Authorization": f"token {GITEA_TOKEN}",
-                        "Content-Type": f"multipart/form-data; boundary={boundary}",
-                    },
-                    method="POST",
-                )
-                urllib.request.urlopen(img_req, timeout=15)
-            except Exception as img_err:
-                pass  # Image upload failed but issue was created
+            for idx, img_b64 in enumerate(images_b64):
+                try:
+                    img_bytes = base64.b64decode(img_b64)
+                    filename = f"screenshot{'_' + str(idx + 1) if idx > 0 else ''}.png"
+                    boundary = f"----FeedbackBoundary{idx}"
+                    body_parts = []
+                    body_parts.append(f"--{boundary}\r\n".encode())
+                    body_parts.append(f'Content-Disposition: form-data; name="attachment"; filename="{filename}"\r\n'.encode())
+                    body_parts.append(b"Content-Type: image/png\r\n\r\n")
+                    body_parts.append(img_bytes)
+                    body_parts.append(f"\r\n--{boundary}--\r\n".encode())
+                    multipart_body = b"".join(body_parts)
+
+                    img_req = urllib.request.Request(
+                        f"{GITEA_URL}/api/v1/repos/{REPO}/issues/{issue_number}/assets",
+                        data=multipart_body,
+                        headers={
+                            "Authorization": f"token {GITEA_TOKEN}",
+                            "Content-Type": f"multipart/form-data; boundary={boundary}",
+                        },
+                        method="POST",
+                    )
+                    urllib.request.urlopen(img_req, timeout=15)
+                except Exception:
+                    pass  # Image upload failed but issue was created
 
         handler._send_json({
             "ok": True,