feat(rag): make Knowledge Base upload size limit configurable

- Increase FileUploader default maxFileSize from 10MB to 100MB
- Add 'rag.maxFileSizeMB' KV store setting for configurable limit
- KnowledgeBaseModal reads setting and passes to FileUploader
- Falls back to 100MB default if setting is not configured

Closes #259

admin/inertia/components/chat/KnowledgeBaseModal.tsx

@@ -10,6 +10,7 @@ import { IconX } from '@tabler/icons-react'
 import { useModals } from '~/context/ModalContext'
 import StyledModal from '../StyledModal'
 import ActiveEmbedJobs from '~/components/ActiveEmbedJobs'
+import { useSystemSetting } from '~/hooks/useSystemSetting'
 
 interface KnowledgeBaseModalProps {
   aiAssistantName?: string
@@ -29,6 +30,13 @@ export default function KnowledgeBaseModal({ aiAssistantName = "AI Assistant", o
   const { openModal, closeModal } = useModals()
   const queryClient = useQueryClient()
 
+  const DEFAULT_MAX_FILE_SIZE_MB = 100
+  const { data: maxFileSizeSetting } = useSystemSetting({ key: 'rag.maxFileSizeMB' })
+  const maxFileSizeMB = maxFileSizeSetting?.value
+    ? Number(maxFileSizeSetting.value)
+    : DEFAULT_MAX_FILE_SIZE_MB
+  const maxFileSize = maxFileSizeMB * 1024 * 1024
+
   const { data: storedFiles = [], isLoading: isLoadingFiles } = useQuery({
     queryKey: ['storedFiles'],
     queryFn: () => api.getStoredRAGFiles(),
@@ -134,6 +142,7 @@ export default function KnowledgeBaseModal({ aiAssistantName = "AI Assistant", o
                 ref={fileUploaderRef}
                 minFiles={1}
                 maxFiles={1}
+                maxFileSize={maxFileSize}
                 onUpload={(uploadedFiles) => {
                   setFiles(Array.from(uploadedFiles))
                 }}

admin/inertia/components/file-uploader/index.tsx

@@ -29,7 +29,7 @@ const FileUploader = forwardRef<FileUploaderRef, FileUploaderProps>((props, ref)
   const {
     minFiles = 0,
     maxFiles = 1,
-    maxFileSize = 10485760, // default to 10MB
+    maxFileSize = 104857600, // default to 100MB
     fileTypes,
     disabled = false,
     onUpload,

admin/types/kv_store.ts

@@ -8,6 +8,7 @@ export const KV_STORE_SCHEMA = {
   'system.earlyAccess':         'boolean',
   'ui.hasVisitedEasySetup':     'boolean',
   'ai.assistantCustomName':     'string',
+  'rag.maxFileSizeMB':          'string',
 } as const
 
 type KVTagToType<T extends string> = T extends 'boolean' ? boolean : string