Add comprehensive repository audit and raccoon mission roadmap

Created docs/AUDIT.md with:
- Complete file inventory and assessment
- Analysis of 10+ abandoned TTS models to integrate
- Multi-tier binary mirror strategy
- Proposed refactoring with engine abstraction
- License clarification (AGPL v3, not MIT)

This audit identifies all non-essential files for removal and documents
the plan to rescue abandoned TTS projects (Silero, StyleTTS2, Bark, etc.)
into a unified resilient system.

🦝 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/AUDIT.md

@@ -53,7 +53,10 @@
 
 ### Documentation (KEEP - Update)
 - `README.md` (16.6K) - Main documentation
-- `LICENSE` - MIT license
+- `LICENSE` - **AGPL v3** (GNU Affero General Public License v3)
+  - **Important:** Network services must provide source code to users
+  - All modifications must be shared under AGPL v3
+  - Perfect for raccoon mission - keeps TTS libre forever!
 - `sample.env` - Environment variable examples
 
 ### CI/CD (KEEP)