Keep searchable text only in knowledgebases

Every bot file was chunked into bot_file_chunks and embedded into
bot_file_vectors, and uploads kept their extracted text in
media.text_content, which together took most of the database. Bot
files are no longer indexed: bots find them by name or path with
list_files and read them with read_file, and search_files, ingest_file
and the files modal's re-read button are gone. Attachments keep no
text; a reply reads a document from the file. Only knowledgebase
documents keep text.

The schema drops both tables and the ingest columns. At boot,
dropStoredFileText removes what older versions stored (file jobs,
upload text) and vacuums once much of the database is free. The
media:prune-text script it replaces is removed.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/pages/admin/bots/[bot_id]/(partials)/bot-files-modal.tsx

@@ -29,10 +29,9 @@ type Props = {
 
 /**
  * The files a conversation works with: a bot's own folder, or the
- * workspace's shared one. Each can be opened, read again so it can be
- * searched, or deleted (a crew manager only). The list loads when the
- * modal opens, and search goes through the same endpoint, so the page
- * props stay small.
+ * workspace's shared one. Each can be opened or deleted (a crew manager
+ * only). The list loads when the modal opens, and search (by name or path)
+ * goes through the same endpoint, so the page props stay small.
  */
 export default function BotFilesModal({ bot, workspace, menu, on_open }: Props) {
     const { pageProps } = useContext(AppContext);
@@ -105,7 +104,7 @@ export default function BotFilesModal({ bot, workspace, menu, on_open }: Props)
                 <H2 className="text-lg! leading-6! tracking-normal! font-bold text-ink">{title}</H2>
                 <Span className="text-[13px] leading-[18px] text-ink-secondary">
                     {workspace?.id
-                        ? `Files every bot here can read and search. They're kept with the app, not on a computer.`
+                        ? `Files every bot here can find and read. They're kept with the app, not on a computer.`
                         : `What ${name} has saved: documents you sent, files it wrote and images it made. They're kept with the app, not on a computer.${can_manage ? " Deleting one removes it for good." : ""}`}
                 </Span>
                 {usage ? (
@@ -128,7 +127,7 @@ export default function BotFilesModal({ bot, workspace, menu, on_open }: Props)
 
             <Stack className="w-full mt-4 gap-2! items-stretch">
                 <Input
-                    placeholder="Search files"
+                    placeholder="Search by name or path"
                     value={search}
                     onChange={(event) => setSearch(event.target.value)}
                     onKeyDown={(event) => {
@@ -146,14 +145,6 @@ export default function BotFilesModal({ bot, workspace, menu, on_open }: Props)
                             file={file}
                             can_manage={can_manage}
                             busy={busy_id == file.id}
-                            onIngest={() =>
-                                run({
-                                    url: `/api/admin/bots/ingest-file`,
-                                    payload: { file_id: file.id },
-                                    file_id: file.id,
-                                    done: `${file.name} will be read again shortly.`,
-                                })
-                            }
                             onDelete={() =>
                                 run({
                                     url: `/api/admin/bots/delete-file`,