Refactor SQLite Database Provider

- Removed unused classes and files related to SQLite database provider, including SqliteDesignTimeJellyfinDbFactory, ModelBuilderExtensions, PragmaConnectionInterceptor, AssemblyInfo, SqliteDatabaseProvider, DateTimeKindValueConverter.
- Updated tests to remove dependencies on removed classes and adjusted mocking for configuration sections.
- Added Microsoft.EntityFrameworkCore.Sqlite package reference to test project.
- Improved string handling in tests for better consistency and clarity.
- Refactored logging methods in JellyfinApplicationFactory for better readability and maintainability.

sql/fix-activitylog-index.sql

@@ -1,27 +0,0 @@
--- ================================================
--- Fix for ActivityLogs Index
--- Run this separately to create the missing index
--- ================================================
---
--- This creates the ActivityLogs index that couldn't be created
--- from within the main migration script due to PostgreSQL
--- limitations with CONCURRENT operations in functions.
---
--- ================================================
-
--- Create the ActivityLogs index
--- This will error gracefully if the table doesn't exist
-CREATE INDEX CONCURRENTLY IF NOT EXISTS idx_activitylogs_userid_datecreated
-ON activitylog."ActivityLogs" ("UserId", "DateCreated" DESC)
-WHERE "UserId" IS NOT NULL;
-
--- Verify it was created
-SELECT 
-    schemaname AS "Schema",
-    tablename AS "Table",
-    indexname AS "Index Name",
-    indexdef AS "Definition"
-FROM pg_indexes
-WHERE indexname = 'idx_activitylogs_userid_datecreated';
-
--- Expected: 1 row showing the index on activitylog.ActivityLogs