feat(capabilities): model capability metadata on /v1/models, combo aggregation, pattern fixes

- Export aggregateComboCapabilities: union for vision/audio/search/pdf,
  intersection for tools, primary-model for reasoning fields, min
  contextWindow, max maxOutput
- Support nested combo resolution in aggregateComboCapabilities via
  comboLookup with depth guard (max 6)
- Wire capability metadata to all /v1/models entries and combos
- Show aggregated ctx/max metadata line and capability badges on combo chips
- Pattern fixes: MiMo v2.5/omni reasoning, qwen max/plus vision, minimax m2.x vision
- Sync commandcode model catalog and add openai gpt-5.5
- Add unit tests for capability patterns and combo capability aggregation

open-sse/providers/registry/openai.js

@@ -28,6 +28,7 @@ export default {
     forceStream: true,
   },
   models: [
+    { id: "gpt-5.5", name: "GPT-5.5" },
     { id: "gpt-5.4", name: "GPT-5.4" },
     { id: "gpt-5.4-mini", name: "GPT-5.4 Mini" },
     { id: "gpt-5.4-nano", name: "GPT-5.4 Nano" },