feat(providers): add SenseNova (商汤日日新) provider

[morandot]

Summary

Adds SenseNova (商汤日日新) as a native LLM provider using the standard OpenAI-compatible endpoint at https://token.sensenova.cn/v1.

Supported Models

• sensenova-6.8-flash-lite (multimodal)
• deepseek-v4-flash
• glm-5.2

Configuration

{
  "providers": {
    "sensenova": {
      "apiKey": "${SENSENOVA_API_KEY}"
    }
  },
  "agents": {
    "defaults": {
      "model": "sensenova-6.8-flash-lite",
      "provider": "sensenova"
    }
  }
}

Routing Note

sensenova-6.8-flash-lite auto-routes via the "sensenova" keyword — no prefix or explicit provider needed. Only deepseek-v4-flash and glm-5.2 bare model names first match the built-in deepseek/zhipu providers; to route those through SenseNova, use the sensenova/ prefix (e.g. sensenova/glm-5.2) or set provider: "sensenova".

Files Changed

• nanobot/providers/registry.py — new ProviderSpec entry
• nanobot/config/schema.py — new provider config field
• nanobot/cli/onboard.py — Quick Start endpoint choice
• webui/src/lib/provider-brand.ts — brand color + initials
• tests/cli/test_commands.py — 3 tests (explicit provider, keyword routing, custom apiBase override)
• webui/src/tests/provider-brand.test.ts — brand assertion
• docs/configuration.md — provider table entry + setup example

Testing

• pytest -k sensenova — 3 passed
• BasedPyright (changed files) — 0 errors / 0 warnings