fix(api): complete anthropic direct profile support

ui/src/components/profiles/profile-create-dialog.tsx

@@ -51,12 +51,18 @@ import type { CategorizedModel } from '@/lib/openrouter-types';
 import type { CliTarget } from '@/lib/api-client';
 import i18n from '@/lib/i18n';
 
+const optionalUrlSchema = z
+  .string()
+  .refine((value) => value.trim().length === 0 || z.string().url().safeParse(value).success, {
+    message: 'Invalid URL format',
+  });
+
 const schema = z.object({
   name: z
     .string()
     .min(1, 'Name is required')
     .regex(/^[a-zA-Z][a-zA-Z0-9._-]*$/, 'Must start with letter, only letters/numbers/.-_'),
-  baseUrl: z.string().url('Invalid URL format'),
+  baseUrl: optionalUrlSchema,
   apiKey: z.string(), // Validation handled conditionally in onSubmit
   model: z.string().optional(),
   opusModel: z.string().optional(),
@@ -389,9 +395,7 @@ export function ProfileCreateDialog({
 
                 {/* Base URL - always editable, pre-filled from preset */}
                 <div className="space-y-1.5">
-                  <Label htmlFor="baseUrl">
-                    API Base URL <span className="text-destructive">*</span>
-                  </Label>
+                  <Label htmlFor="baseUrl">API Base URL</Label>
                   <Input
                     id="baseUrl"
                     {...register('baseUrl')}
@@ -406,7 +410,9 @@ export function ProfileCreateDialog({
                     </div>
                   ) : currentPreset ? (
                     <p className="text-xs text-muted-foreground">
-                      Pre-filled from {currentPreset.name}. You can customize if needed.
+                      {currentPreset.baseUrl
+                        ? `Pre-filled from ${currentPreset.name}. You can customize if needed.`
+                        : `Optional for ${currentPreset.name}. Leave blank to use native Anthropic auth.`}
                     </p>
                   ) : (
                     <p className="text-xs text-muted-foreground">

ui/src/components/profiles/profile-dialog.tsx

@@ -19,13 +19,18 @@ import { ChevronDown, ChevronRight } from 'lucide-react';
 import { useTranslation } from 'react-i18next';
 
 const DEFAULT_MODEL = 'claude-sonnet-4-5-20250929';
+const optionalUrlSchema = z
+  .string()
+  .refine((value) => value.trim().length === 0 || z.string().url().safeParse(value).success, {
+    message: 'Invalid URL',
+  });
 
 const schema = z.object({
   name: z
     .string()
     .min(1, 'Name is required')
     .regex(/^[a-zA-Z][a-zA-Z0-9._-]*$/, 'Invalid profile name'),
-  baseUrl: z.string().url('Invalid URL'),
+  baseUrl: optionalUrlSchema,
   apiKey: z.string().min(10, 'API key must be at least 10 characters'),
   model: z.string().optional(),
   opusModel: z.string().optional(),