Configure the Hub's AI provider for web clients (v0.16.0)

[gmpassos]

Completes the dashboard :ai / :ide work (shipped in dashboard 0.3.0): those agents proxy their provider calls through the Hub so no browser holds an API key — but omnyserver's Hub served no AI, so :ai had no default and only worked with a key typed into the dashboard. This gives the Hub an AI provider.

The gap

omnyserver's ShellHub.fromGrants built the omnyshell HubBroker without an aiProxy, so a web client's fetchHubAiConfig always answered available: false and every proxy request was rejected.

Changes

• ShellHub.fromGrants(aiConfig:) → passes aiProxy: HttpProxyService(defaultConfig: aiConfig) to the broker. That single wiring lights up fetchHubAiConfig (key-less discovery) and the credential-injecting proxy — the key stays on the Hub.
• hub start --ai-config (default <OMNYSERVER_HOME>/ai.yaml) → AiConfigIo.load → threaded in under --shell. Startup reports Hub AI: <provider> — proxying … or not configured.
• omnyserver ai config | show | test — mirrors omnyshell ai …:
  • config writes provider/model/key/mode/language to ~/.omnyserver/ai.yaml (mode 600; --key - reads from a hidden prompt)
  • show prints the resolved config, key masked
  • test validates the key + models with a live provider request
  • keys may also come from ANTHROPIC_API_KEY / OPENAI_API_KEY / GEMINI_API_KEY

Almost entirely reuse

AiConfig, AiConfigIo, HttpProxyService, providerFor, validateModels are all public in the omnyshell package omnyserver already depends on — this is CLI glue + the one broker wiring. Adds http (for ai test).

Verification

• 291 tests + new: shell_hub_ai_test.dart (aiConfig → broker gets a proxy; without → none) and ai_command_test.dart (subprocess config/show/errors, isolated home).
• Driven for real: ai config writes ~/.omnyserver/ai.yaml, ai show reflects it (key masked), and hub start --shell reports Hub AI: anthropic — proxying :ai for web clients (or not configured when absent).
• analyze/format/dependency_validator/dart doc clean.

Note

The reused AiConfigIo writes a header comment reading ~/.omnyshell/ai.yaml even in omnyserver's file — cosmetic only (it's a comment), left as-is to avoid a needless omnyshell patch.

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