TTS-020: Integrate TTS into BaseProvider.generate()

[murdore]

Summary

Integrate TTS synthesis into the BaseProvider.generate() method.

Technical Details

• File(s): src/lib/core/baseProvider.ts
• Effort: 3h

Acceptance Criteria

• [ ] Check if options.tts?.enabled === true in generate() method
• [ ] Extract final text response from AI generation
• [ ] Call TTSProcessor.synthesize(text, options.tts, providerName)
• [ ] Add TTSResult to GenerateResult as audio field
• [ ] Error handling: log TTS errors but don't fail request
• [ ] Add TTS latency to response metadata
• [ ] Document behavior in JSDoc comments
• [ ] Integration test: generate() with TTS returns audio

Dependencies

• Depends on: TTS-001, TTS-003, TTS-008, TTS-012, TTS-016, TTS-019
• Blocks: none

Priority: high | Effort: 3h | Complexity: moderate