Add project documentation templates and enhance architecture documentation (#183)

Update architecture docs to reflect Clean Architecture structure (#182)

Update all imports to canonical module paths after reorganization (#181)

Extract use cases from handlers to application layer (Clean Architecture) (#180)

refactor: rename handlers → transport layer (Clean Architecture) (#179)

Move concurrency utilities into application layer (#178)

Move jobs into application layer (#177)

Move connectors to infrastructure/external (#174)

Move entities to infrastructure/persistence/entities (#173)

Refactor: Migrate domain/ to domains/ and remove legacy folder (#163)

Refactor API to Domain-Driven Design architecture (#161)

docs: restructure web documentation

docs: remove outdated documentation folders

Feature/account domain ddd (#160)

docs: Add Mermaid Architecture Diagrams (DDD + Business Layers) (#158)