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/services/project.ts

@@ -95,6 +95,22 @@ export interface ProjectSettings {
   enabled_shot_tasks?: string[]
 }
 
+export interface SubmissionTypeConfig {
+  allowed_extensions: string[]
+  naming_pattern?: string | null
+  check_naming: boolean
+  required: boolean
+  check_movie_spec: boolean
+  movie_resolution?: string | null
+  movie_format?: string | null
+  movie_codec?: string | null
+  movie_frame_rate?: number | null
+}
+
+export interface ProjectSubmissionConfig {
+  config_by_task_type: Record<string, SubmissionTypeConfig>
+}
+
 export const projectService = {
   async getUserProjects(): Promise<Project[]> {
     const response = await apiClient.get('/projects/')
@@ -182,6 +198,16 @@ export const projectService = {
     return response.data
   },
 
+  async getProjectSubmissionConfig(projectId: number): Promise<ProjectSubmissionConfig> {
+    const response = await apiClient.get(`/projects/${projectId}/submission-config`)
+    return response.data
+  },
+
+  async updateProjectSubmissionConfig(projectId: number, config: ProjectSubmissionConfig): Promise<ProjectSubmissionConfig> {
+    const response = await apiClient.put(`/projects/${projectId}/submission-config`, config)
+    return response.data
+  },
+
   async uploadThumbnail(projectId: number, file: File): Promise<{ message: string; thumbnail_url: string }> {
     const formData = new FormData()
     formData.append('file', file)