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6bfab51293 Add Scale chapter with sharding and database optimization docs
New Chapter 18 - Scale:
- README with overview of scaling architecture
- Sharding Architecture: tenant routing, shard config, data model, operations
- Database Optimization: SMALLINT enums, indexing, partitioning, connection pooling

Enum reference tables for all domain values (Channel, Message, Task, etc.)
Best practices for billion-user scale deployments
2025-12-29 12:55:32 -03:00