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-client-sdk/src/metadata/generated/schema.graphql

@@ -1989,7 +1989,7 @@ type ClientConfig {
   isMultiWorkspaceEnabled: Boolean!
   isEmailVerificationRequired: Boolean!
   defaultSubdomain: String
-  subdomainMinLength: Float!
+  subdomainMinLength: Float! @deprecated(reason: "Subdomain minimum length is no longer configurable; kept one release for API compatibility, no longer read by the frontend.")
   frontDomain: String!
   publicFunctionDomain: String
   analyticsEnabled: Boolean!

packages/twenty-client-sdk/src/metadata/generated/schema.ts

@@ -1626,6 +1626,7 @@ export interface ClientConfig {
     isMultiWorkspaceEnabled: Scalars['Boolean']
     isEmailVerificationRequired: Scalars['Boolean']
     defaultSubdomain?: Scalars['String']
+    /** @deprecated Subdomain minimum length is no longer configurable; kept one release for API compatibility, no longer read by the frontend. */
     subdomainMinLength: Scalars['Float']
     frontDomain: Scalars['String']
     publicFunctionDomain?: Scalars['String']
@@ -4895,6 +4896,7 @@ export interface ClientConfigGenqlSelection{
     isMultiWorkspaceEnabled?: boolean | number
     isEmailVerificationRequired?: boolean | number
     defaultSubdomain?: boolean | number
+    /** @deprecated Subdomain minimum length is no longer configurable; kept one release for API compatibility, no longer read by the frontend. */
     subdomainMinLength?: boolean | number
     frontDomain?: boolean | number
     publicFunctionDomain?: boolean | number