fix: improve logging and error visibility, move Story 1.7 to Epic 2

Fixes:
- Added database connection logging with masked DSN
- Added migration progress logging
- Added HTTP server startup logging with address
- Fixed database provider to accept logger parameter
- Improved error visibility throughout initialization

Documentation:
- Moved Story 1.7 (Service Client Interfaces) to Epic 2 as Story 2.7
- Updated Epic 1 and Epic 2 READMEs
- Updated COMPLETE_TASK_LIST.md
- Updated story metadata (ID, Epic, Dependencies)

These changes will help diagnose startup issues and provide better visibility into what the application is doing.

config/default.yaml

@@ -8,7 +8,7 @@ server:
 
 database:
   driver: "postgres"
-  dsn: ""
+  dsn: "postgres://goplt:goplt_password@localhost:5432/goplt?sslmode=disable"
   max_connections: 25
   max_idle_connections: 5
   conn_max_lifetime: 5m