refactor(web): make description optional and remove default values for bot, pipeline, and knowledge base

- Remove .min(1) validation on description field, replace with .optional().default('')
- Remove pre-filled default description text from all three create forms
- Remove required asterisk (*) marker from description labels
- No backend changes needed: Bot/Pipeline DB accepts empty string, KB DB allows null

web/src/app/home/bots/components/bot-form/BotForm.tsx

@@ -53,9 +53,7 @@ import { CustomApiError } from '@/app/infra/entities/common';
 const getFormSchema = (t: (key: string) => string) =>
   z.object({
     name: z.string().min(1, { message: t('bots.botNameRequired') }),
-    description: z
-      .string()
-      .min(1, { message: t('bots.botDescriptionRequired') }),
+    description: z.string().optional().default(''),
     adapter: z.string().min(1, { message: t('bots.adapterRequired') }),
     adapter_config: z.record(z.string(), z.any()),
     enable: z.boolean().optional(),
@@ -80,7 +78,7 @@ export default function BotForm({
     resolver: zodResolver(formSchema),
     defaultValues: {
       name: '',
-      description: t('bots.defaultDescription'),
+      description: '',
       adapter: '',
       adapter_config: {},
       enable: true,
@@ -427,10 +425,7 @@ export default function BotForm({
               name="description"
               render={({ field }) => (
                 <FormItem>
-                  <FormLabel>
-                    {t('bots.botDescription')}
-                    <span className="text-destructive">*</span>
-                  </FormLabel>
+                  <FormLabel>{t('bots.botDescription')}</FormLabel>
                   <FormControl>
                     <Input {...field} />
                   </FormControl>

web/src/app/home/knowledge/components/kb-form/KBForm.tsx

@@ -46,9 +46,7 @@ import { UUID } from 'uuidjs';
 const getFormSchema = (t: (key: string) => string) =>
   z.object({
     name: z.string().min(1, { message: t('knowledge.kbNameRequired') }),
-    description: z
-      .string()
-      .min(1, { message: t('knowledge.kbDescriptionRequired') }),
+    description: z.string().optional().default(''),
     emoji: z.string().optional(),
     ragEngineId: z
       .string()
@@ -115,7 +113,7 @@ export default function KBForm({
     resolver: zodResolver(formSchema),
     defaultValues: {
       name: '',
-      description: t('knowledge.defaultDescription'),
+      description: '',
       emoji: '📚',
       ragEngineId: '',
     },
@@ -373,10 +371,7 @@ export default function KBForm({
               name="description"
               render={({ field }) => (
                 <FormItem>
-                  <FormLabel>
-                    {t('knowledge.kbDescription')}
-                    <span className="text-destructive">*</span>
-                  </FormLabel>
+                  <FormLabel>{t('knowledge.kbDescription')}</FormLabel>
                   <FormControl>
                     <Input {...field} />
                   </FormControl>

web/src/app/home/pipelines/components/pipeline-form/PipelineFormComponent.tsx

@@ -80,9 +80,7 @@ export default function PipelineFormComponent({
     ? z.object({
         basic: z.object({
           name: z.string().min(1, { message: t('pipelines.nameRequired') }),
-          description: z
-            .string()
-            .min(1, { message: t('pipelines.descriptionRequired') }),
+          description: z.string().optional().default(''),
           emoji: z.string().optional(),
         }),
         ai: z.record(z.string(), z.any()),
@@ -93,9 +91,7 @@ export default function PipelineFormComponent({
     : z.object({
         basic: z.object({
           name: z.string().min(1, { message: t('pipelines.nameRequired') }),
-          description: z
-            .string()
-            .min(1, { message: t('pipelines.descriptionRequired') }),
+          description: z.string().optional().default(''),
           emoji: z.string().optional(),
         }),
         ai: z.record(z.string(), z.any()).optional(),
@@ -563,10 +559,7 @@ export default function PipelineFormComponent({
                           name="basic.description"
                           render={({ field }) => (
                             <FormItem>
-                              <FormLabel>
-                                {t('common.description')}
-                                <span className="text-destructive">*</span>
-                              </FormLabel>
+                              <FormLabel>{t('common.description')}</FormLabel>
                               <FormControl>
                                 <Input {...field} />
                               </FormControl>