feat(ldap): opt-in skip TLS verification for ldaps (internal CA)

Add a per-tenant "Skip TLS certificate verification" toggle to the LDAP
admin page so admins can connect to an AD whose ldaps:// certificate is
signed by an internal/self-signed CA (Node error: "unable to verify the
first certificate"). When enabled, ldapts is given
tlsOptions.rejectUnauthorized=false; the flag is ignored for plain ldap://
(no TLS). Defaults to full verification.

New Boolean column LdapConfig.tlsRejectUnauthorized (@default(true)) +
migration; wired through DTOs, config service, all Client creations
(test/groups/user-search/import/sync) and the test-connection endpoint. UI
checkbox with an insecure-network warning (de/en). 3 new service specs;
API 218 green, web 131 green, both apps tsc clean.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/api/src/ldap/dto/ldap-config.dto.ts

@@ -43,6 +43,10 @@ export class CreateLdapConfigDto {
   @IsOptional()
   isActive?: boolean;
 
+  @IsBoolean()
+  @IsOptional()
+  tlsRejectUnauthorized?: boolean;
+
   @IsArray()
   @IsString({ each: true })
   @IsOptional()
@@ -76,6 +80,10 @@ export class TestConnectionDto {
   @IsString()
   @IsOptional()
   bindPassword?: string;
+
+  @IsBoolean()
+  @IsOptional()
+  tlsRejectUnauthorized?: boolean;
 }
 
 /**