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_rengoku_test.go

@@ -1,7 +1,6 @@
 package channelserver
 
 import (
-	dbutil "erupe-ce/common/db"
 	"testing"
 
 	"github.com/jmoiron/sqlx"
@@ -13,7 +12,7 @@ func setupRengokuRepo(t *testing.T) (*RengokuRepository, *sqlx.DB, uint32, uint3
 	userID := CreateTestUser(t, db, "rengoku_test_user")
 	charID := CreateTestCharacter(t, db, userID, "RengokuChar")
 	guildID := CreateTestGuild(t, db, charID, "RengokuGuild")
-	repo := NewRengokuRepository(dbutil.Wrap(db))
+	repo := NewRengokuRepository(db)
 	t.Cleanup(func() { TeardownTestDB(t, db) })
 	return repo, db, charID, guildID
 }