improve Gitea PR plugin with correct filter options

- Replace custom filters with Gitea UI equivalents (your repos, assigned,
  created, review requested, reviewed, mentioned)
- Fix pagination to fetch all pages from issues/search
- Filter out false-positive issues (pull_request: null)
- Use issues/search API for all filters (correct token scopes required)
- Add StreamAction registration

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

manifest.json

@@ -75,6 +75,19 @@
       ],
       "Tooltip": "Shows light color, time and mode from an ESP32 model railway controller via MQTT",
       "UUID": "dev.mars3142.ulanzideck.collection.railway"
+    },
+    {
+      "Name": "Model Railway Stream",
+      "Icon": "assets/icons/railway.png",
+      "PropertyInspectorPath": "property-inspector/stream/inspector.html",
+      "States": [
+        {
+          "Name": "Default",
+          "Image": "assets/icons/railway.png"
+        }
+      ],
+      "Tooltip": "Displays the live 128x64 monochrome display stream from an ESP32 model railway controller via MQTT",
+      "UUID": "dev.mars3142.ulanzideck.collection.stream"
     }
   ],
   "OS": [