fix(build): ship jalaali types with production dependencies

Move @types/jalaali-js into dependencies and add a local module declaration so nest build works when installing without devDependencies.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/tenants/tenants.service.ts

@@ -434,12 +434,12 @@ export class TenantsService {
   }
 
   private handleUnique(error: unknown) {
-    if (
-      error instanceof Prisma.PrismaClientKnownRequestError &&
-      error.code === 'P2002'
-    ) {
+    if (!(error instanceof Prisma.PrismaClientKnownRequestError)) {
+      return;
+    }
+    if (error.code === 'P2002') {
       const targets = Array.isArray(error.meta?.target)
-        ? (error.meta?.target as string[])
+        ? (error.meta.target as string[])
         : [];
       if (targets.includes('slug')) {
         throw new ConflictException('slug تکراری است — این slug قبلاً برای نسخه دیگری ثبت شده');
@@ -451,5 +451,6 @@ export class TenantsService {
       }
       throw new ConflictException('slug یا domain تکراری است');
     }
+    }
   }
 }

src/types/jalaali-js.d.ts

@@ -0,0 +1,19 @@
+declare module 'jalaali-js' {
+  export function toJalaali(
+    gy: number,
+    gm: number,
+    gd: number,
+  ): { jy: number; jm: number; jd: number }
+
+  export function toGregorian(
+    jy: number,
+    jm: number,
+    jd: number,
+  ): { gy: number; gm: number; gd: number }
+
+  export function isValidJalaaliDate(jy: number, jm: number, jd: number): boolean
+
+  export function isLeapJalaaliYear(jy: number): boolean
+
+  export function jalaaliMonthLength(jy: number, jm: number): number
+}