feat(frontend): remove IngestPanel from LTT page (sub-phase 2.1)

Remove redundant upload panel from LTT page. Upload functionality lives on the RAG Database page.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/src/pages/LTTPage.tsx

@@ -1,10 +1,9 @@
 import React from 'react'
 import { Film } from 'lucide-react'
-import { useQueryDocument, useIngestDocument } from '../lib/queries'
+import { useQueryDocument } from '../lib/queries'
 import { QueryInput } from '../components/QueryInput'
 import { KeywordsDisplay } from '../components/KeywordsDisplay'
 import { ResponsePanel } from '../components/ResponsePanel'
-import { IngestPanel } from '../components/IngestPanel'
 
 const VideoPlaceholder: React.FC = () => {
   return (
@@ -19,16 +18,11 @@ const VideoPlaceholder: React.FC = () => {
 
 export const LTTPage: React.FC = () => {
   const queryMutation = useQueryDocument()
-  const ingestMutation = useIngestDocument()
 
   const handleQuerySubmit = (question: string): void => {
     queryMutation.mutate({ question })
   }
 
-  const handleFileUpload = (file: File): void => {
-    ingestMutation.mutate(file)
-  }
-
   return (
     <div className="h-full grid grid-rows-[30%_1fr] grid-cols-2 bg-gray-50">
       <div className="border-r border-b border-gray-200 p-4 min-h-0 overflow-hidden">
@@ -37,12 +31,6 @@ export const LTTPage: React.FC = () => {
       <div className="border-b border-gray-200 p-6 flex flex-col gap-4 overflow-y-auto min-h-0">
         <QueryInput onSubmit={handleQuerySubmit} isLoading={queryMutation.isPending} />
         <KeywordsDisplay keywords={queryMutation.data?.keywords} isLoading={queryMutation.isPending} />
-        <IngestPanel
-          onUpload={handleFileUpload}
-          isLoading={ingestMutation.isPending}
-          success={ingestMutation.isSuccess ? ingestMutation.data?.filename ?? null : null}
-          error={ingestMutation.isError ? (ingestMutation.error instanceof Error ? ingestMutation.error.message : 'Upload failed') : null}
-        />
       </div>
       <div className="col-span-2 p-6 border-t border-gray-200 overflow-y-auto min-h-0">
         <ResponsePanel