feat: add video OCR/ASR, DOCX/PDF export, input block and risk config updates

- Video pipeline: video file OCR via VLM plus audio track ASR, integrated
  into job_handlers with progress emit per phase. New media_utils.py for
  audio extraction from video files.
- Document export: richExport.js replaces inline docx builder; DOCX and PDF
  export buttons are now enabled in MilkdownEditor. File size limit raised to
  100 MB.
- Input block: new InputBlockCrepe.vue component with inputBlockPlugin.ts
  and inputBlock.js for custom user-input nodes in the editor.
- Risk config: added Vite dev server ports (5173) to CORS allowlist and
  increased OCR max input from 10 MB to 100 MB.
- TTS/ASR refactor: simplified tts_asr.py model loading and warmup logic.
- Test coverage: updated tests for llm, main endpoints, pro completions and
  web search modules.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/utils/docBlock.js

@@ -18,6 +18,7 @@ function clipDocContext(content = '', limit = 0) {
 }
 
 const AUDIO_EXT_RE = /\.(wav|mp3|m4a|ogg|flac)$/i
+const VIDEO_EXT_RE = /\.(mp4|webm|mov|avi|mkv|m4v|ogv)$/i
 
 export function normalizeDocType(value = '') {
   const lower = String(value || '').trim().toLowerCase()
@@ -61,6 +62,13 @@ export function isAudioFile(file) {
   return AUDIO_EXT_RE.test(name) || type.startsWith('audio/')
 }
 
+export function isVideoFile(file) {
+  if (!file) return false
+  const name = String(file.name || '').toLowerCase()
+  const type = String(file.type || '').toLowerCase()
+  return VIDEO_EXT_RE.test(name) || type.startsWith('video/')
+}
+
 export function isSupportedDocFile(file) {
   if (!file) return false
   const name = String(file.name || '').toLowerCase()
@@ -75,6 +83,7 @@ export function isSupportedDocFile(file) {
     name.endsWith('.pptx') ||
     name.endsWith('.pdf') ||
     AUDIO_EXT_RE.test(name) ||
+    VIDEO_EXT_RE.test(name) ||
     type === 'text/plain' ||
     type === 'application/json' ||
     type === 'text/yaml' ||
@@ -83,7 +92,8 @@ export function isSupportedDocFile(file) {
     type === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' ||
     type === 'application/vnd.openxmlformats-officedocument.presentationml.presentation' ||
     type === 'application/pdf' ||
-    type.startsWith('audio/')
+    type.startsWith('audio/') ||
+    type.startsWith('video/')
   )
 }