feat: implement comprehensive recipe management schema

- Add full database schema with accounts, dishes, ingredients, categories, and pricing
- Implement custom types for weight, currency, recipe difficulty, and color hex
- Add soft delete pattern with deleted_at and active views for all tables
- Include journaling triggers for created_at/updated_at automation

feat: add SQLC configuration with proper type overrides
- Configure SQLC to use UUID, decimal, and timestamptz types with proper Go mappings
- Add github.com/shopspring/decimal dependency for precise decimal handling
- Set up proper pointer handling for nullable fields in generated structs

refactor: replace simple food_items with full dish management system
- Remove old FoodItem model and replace with comprehensive Dish model
- Implement dish creation and retrieval queries with full field support
- Add ingredient management with weight/amount tracking

chore: update infrastructure dependencies
- Switch to custom PostgreSQL image with pg_idkit extension for UUIDv7 support
- Add DATABASE_URI environment variable configuration
- Update Docker Compose configuration for new database image

chore: organize SQL with fold markers and section comments
- Add vim fold markers for better code navigation
- Structure schema into clear sections: extensions, types, tables, triggers
- Separate query files with organized comment blocks

backend/go.sum

@@ -52,6 +52,8 @@ github.com/quic-go/qpack v0.5.1 h1:giqksBPnT/HDtZ6VhtFKgoLOWmlyo9Ei6u9PqzIMbhI=
 github.com/quic-go/qpack v0.5.1/go.mod h1:+PC4XFrEskIVkcLzpEkbLqq1uCoxPhQuvK5rH1ZgaEg=
 github.com/quic-go/quic-go v0.54.0 h1:6s1YB9QotYI6Ospeiguknbp2Znb/jZYjZLRXn9kMQBg=
 github.com/quic-go/quic-go v0.54.0/go.mod h1:e68ZEaCdyviluZmy44P6Iey98v/Wfz6HCjQEm+l8zTY=
+github.com/shopspring/decimal v1.4.0 h1:bxl37RwXBklmTi0C79JfXCEBD1cqqHt0bbgBAGFp81k=
+github.com/shopspring/decimal v1.4.0/go.mod h1:gawqmDU56v4yIKSwfBSFip1HdCCXN8/+DMd9qYNcwME=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=