Revert "Make subdomain minimum length configurable via env var" (#23871)

Instead, reduce the subdomain minimum length to 1 char

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packages/twenty-shared/src/utils/subdomain/__tests__/getSubdomainSlugFromDisplayName.test.ts

@@ -41,8 +41,9 @@ describe('getSubdomainSlugFromDisplayName', () => {
     expect(getSubdomainSlugFromDisplayName('日本語')).toBe('ri-ben-yu');
   });
 
-  it('should return undefined when the result is shorter than the minimum length', () => {
-    expect(getSubdomainSlugFromDisplayName('AB')).toBeUndefined();
+  it('should accept results as short as a single character', () => {
+    expect(getSubdomainSlugFromDisplayName('AB')).toBe('ab');
+    expect(getSubdomainSlugFromDisplayName('A')).toBe('a');
   });
 
   it('should clamp long names to the maximum length without a trailing hyphen', () => {

packages/twenty-shared/src/utils/subdomain/getSubdomainSlugFromDisplayName.ts

@@ -2,7 +2,7 @@ import { slugify } from 'transliteration';
 
 import { isDefined } from '@/utils/validation/isDefined';
 
-const SUBDOMAIN_MIN_LENGTH = 3;
+const SUBDOMAIN_MIN_LENGTH = 1;
 const SUBDOMAIN_MAX_LENGTH = 30;
 
 export const getSubdomainSlugFromDisplayName = (

packages/twenty-shared/src/utils/validation/__tests__/isValidTwentySubdomain.test.ts

@@ -16,12 +16,10 @@ describe('isValidTwentySubdomain', () => {
       expect(isValidTwentySubdomain('a-b-c-d-e')).toBe(true);
     });
 
-    it('should accept short subdomains regardless of minimum length', () => {
-      // Minimum length is enforced by the caller, not by the pattern
+    it('should accept minimum length subdomains (1 character)', () => {
       expect(isValidTwentySubdomain('a')).toBe(true);
+      expect(isValidTwentySubdomain('1')).toBe(true);
       expect(isValidTwentySubdomain('ab')).toBe(true);
-      expect(isValidTwentySubdomain('abc')).toBe(true);
-      expect(isValidTwentySubdomain('a1b')).toBe(true);
       expect(isValidTwentySubdomain('a-b')).toBe(true);
     });