Add per-task-type submission configuration with client-side movie spec checks

Coordinators can configure, per task type, accepted file extensions, a
naming convention, and (for video files) required resolution/format/
codec/frame rate. All checking happens entirely client-side in the
browser before upload - the backend only stores and validates the
configuration itself, never inspects submitted files.

- backend: submission_config_by_task_type JSON column on Project,
  schemas/submission_config.py for validation, GET/PUT
  /projects/{id}/submission-config endpoints. Added .mxf/.ma/.usd(a/c)
  to the supported file formats.
- frontend: new Submissions tab in Project Settings
  (SubmissionConfigManager.vue) to configure rules per task type.
  TaskSubmissions.vue enforces them before upload: extension/naming
  checks via regex, and real video resolution/codec/frame rate
  detection via mediainfo.js (parses container metadata directly,
  so it works for formats browsers can't play natively like MXF,
  ProRes, or DNxHD).

frontend/src/components/task/TaskDetailPanel.vue

@@ -201,7 +201,14 @@
 
         <!-- Submissions Tab -->
         <TabsContent value="submissions" class="flex-1 m-0 overflow-hidden">
-          <TaskSubmissions :task-id="taskId" :submissions="submissions" @submissions-updated="loadSubmissions" />
+          <TaskSubmissions
+            :task-id="taskId"
+            :submissions="submissions"
+            :task-type="task?.task_type"
+            :project-id="task?.project_id"
+            :name="task?.shot_name || task?.asset_name"
+            @submissions-updated="loadSubmissions"
+          />
         </TabsContent>
       </Tabs>
     </div>