Implement dashboard and audit log templates, add paginated audit log support

- Added `web/templates/{dashboard,audit,base,accounts,account_detail}.html` for a consistent UI.
- Implemented new audit log endpoint (`GET /v1/audit`) with filtering and pagination via `ListAuditEventsPaged`.
- Extended `AuditQueryParams`, added `AuditEventView` for joined actor/target usernames.
- Updated configuration (`goimports` preference), linting rules, and E2E tests.
- No logic changes to existing APIs.

internal/db/migrate.go

@@ -7,8 +7,8 @@ import (
 
 // migration represents a single schema migration with an ID and SQL statement.
 type migration struct {
-	id  int
 	sql string
+	id  int
 }
 
 // migrations is the ordered list of schema migrations applied to the database.