chore(db): add AppSetting model

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

prisma/migrations/manual-add_app_setting/migration.sql

@@ -0,0 +1,18 @@
+-- Manual migration to add AppSetting table
+-- This SQL is for SQLite and stores JSON in a TEXT column
+
+CREATE TABLE IF NOT EXISTS "AppSetting" (
+  "id" INTEGER PRIMARY KEY AUTOINCREMENT,
+  "key" TEXT NOT NULL UNIQUE,
+  "value" TEXT NOT NULL,
+  "description" TEXT,
+  "updatedAt" DATETIME NOT NULL DEFAULT (CURRENT_TIMESTAMP),
+  "updatedBy" TEXT
+);
+
+-- Optional: trigger to update updatedAt on row update
+CREATE TRIGGER IF NOT EXISTS "AppSetting_updatedAt"
+AFTER UPDATE ON "AppSetting"
+BEGIN
+  UPDATE "AppSetting" SET "updatedAt" = CURRENT_TIMESTAMP WHERE "id" = NEW."id";
+END;