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.

docs/content/stories/epic1/README.md

@@ -35,11 +35,6 @@ Extend DI container to support all core services, implement database layer with
 - **Goal:** Integrate OpenTelemetry for distributed tracing across the platform to enable observability in production.
 - **Deliverables:** OpenTelemetry setup, HTTP instrumentation, database instrumentation, trace-log correlation
 
-### 1.7 Service Client Interfaces
-- [Story: 1.7 - Service Client Interfaces](./1.7-service-abstraction-layer.md)
-- **Goal:** Create service client interfaces for all core services to enable microservices communication.
-- **Deliverables:** Service client interfaces, service factory, configuration
-
 ## Deliverables Checklist
 - [ ] DI container with all core services
 - [ ] Database client with Ent schema
@@ -47,7 +42,6 @@ Extend DI container to support all core services, implement database layer with
 - [ ] Error bus captures and logs errors
 - [ ] HTTP server with middleware stack
 - [ ] Basic observability with OpenTelemetry
-- [ ] Service client interfaces for microservices
 
 ## Acceptance Criteria
 - `GET /healthz` returns 200