feat: add API key support for custom OpenAI-compatible providers

[unn-Known1]

Summary

This PR adds API key authentication support for custom OpenAI-compatible model backends. It introduces a new UI component for configuring base URL and API key, extends the configuration schema to persist credentials, and threads the API key parameter through provider factory functions and all construction callsites.

Changes Made

Frontend UI

• New CustomModelSection component in settings for configuring custom OpenAI-compatible providers
• Added API key and base URL inputs with save functionality
• Integrated into LocalModelDebugPanel settings page

Backend Configuration

• Extended Config struct with api_key field
• Extended LocalAiConfig with base_url and api_key fields
• Added api_key to model settings update schema
• Config snapshot includes API key for frontend retrieval

Provider Integration

• Threaded api_key parameter through all provider factory functions
• Updated create_backend_inference_provider to use OpenAI-compatible provider when API key is set
• Updated all callsites to pass API key
• Simplified authentication style in routing factory

Code Quality

• Fixed Prettier import order in LocalModelDebugPanel.tsx
• Removed stray blank line before CustomModelSection
• Removed scratch.js (outdated debugging file)
• Fixed Rust formatting in providers/ops.rs

Files Changed

File	Change
app/src/components/settings/panels/local-model/CustomModelSection.tsx	New component
app/src/components/settings/panels/LocalModelDebugPanel.tsx	Added CustomModelSection
app/src/utils/tauriCommands/config.ts	Added api_key to interface
src/openhuman/config/schema/types.rs	Added api_key to Config
src/openhuman/config/schema/local_ai.rs	Added base_url, api_key
src/openhuman/config/ops.rs	Handle api_key in patches
src/openhuman/config/schemas.rs	Schema updates
src/openhuman/providers/ops.rs	Provider API key support
src/openhuman/routing/factory.rs	Routing with API key
src/openhuman/agent/...	Agent integration
src/openhuman/threads/ops.rs	Thread title generation
src/openhuman/channels/...	Channel startup
src/openhuman/learning/...	LinkedIn enrichment
src/openhuman/tools/...	Tool delegate

Closes #867

Testing

• Manual testing with custom OpenAI-compatible endpoint
• Verify API key is properly threaded through providers
• Verify config persistence
• Add Vitest unit tests for CustomModelSection (future)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3ed522af-c0c9-491e-9b87-9190df106fdc

📥 Commits

Reviewing files that changed from the base of the PR and between d2f0457 and 04f3f28.

📒 Files selected for processing (17)

• app/src/components/settings/panels/LocalModelDebugPanel.tsx
• app/src/components/settings/panels/local-model/CustomModelSection.tsx
• app/src/utils/tauriCommands/config.ts
• src/openhuman/agent/harness/session/builder.rs
• src/openhuman/agent/triage/routing.rs
• src/openhuman/channels/routes.rs
• src/openhuman/channels/runtime/startup.rs
• src/openhuman/config/ops.rs
• src/openhuman/config/schema/local_ai.rs
• src/openhuman/config/schema/types.rs
• src/openhuman/config/schemas.rs
• src/openhuman/learning/linkedin_enrichment.rs
• src/openhuman/local_ai/ops.rs
• src/openhuman/providers/ops.rs
• src/openhuman/routing/factory.rs
• src/openhuman/threads/ops.rs
• src/openhuman/tools/impl/agent/delegate.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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