revert: remove SQLite support

An MMO server without multiplayer defeats the purpose. PostgreSQL
is the right choice and Docker Compose already solves the setup
pain. This reverts the common/db wrapper, SQLite schema, config
Driver field, modernc.org/sqlite dependency, and all repo type
changes while keeping the dashboard, wizard, and CI improvements
from the previous commit.

server/channelserver/repo_scenario_test.go

@@ -1,7 +1,6 @@
 package channelserver
 
 import (
-	dbutil "erupe-ce/common/db"
 	"testing"
 
 	"github.com/jmoiron/sqlx"
@@ -10,7 +9,7 @@ import (
 func setupScenarioRepo(t *testing.T) (*ScenarioRepository, *sqlx.DB) {
 	t.Helper()
 	db := SetupTestDB(t)
-	repo := NewScenarioRepository(dbutil.Wrap(db))
+	repo := NewScenarioRepository(db)
 	t.Cleanup(func() { TeardownTestDB(t, db) })
 	return repo, db
 }