Fixed critical bugs identified by bot reviews:
1. baseUrl now used in listAzureVoices (was computed but unused)
2. region now used in synthesize endpoint construction
3. Deprecated-voice filter runs BEFORE map (Status field available)
4. Added azure to ResolvedTtsConfig type
5. Added azure to TtsDirectiveOverrides for directive support
6. Added DEFAULT_AZURE_OUTPUT_FORMAT constant
7. Added AbortController timeout for synthesize requests
8. Used type assertion for config.azure access (req.config as any)
All changes follow the suggested fixes from greptile-apps and chatgpt-codex-connector reviews.
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