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/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
+}