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).

backend/schemas/submission_config.py

@@ -0,0 +1,103 @@
+"""
+Pydantic schemas for per-task-type submission configuration
+"""
+from pydantic import BaseModel, Field, validator
+from typing import Optional, Dict, List
+import re
+
+from utils.file_handler import file_handler
+
+# Tokens supported in a naming_pattern: {name} (shot/asset name), {task_type}, {version}
+NAMING_PATTERN_TOKEN_RE = re.compile(r'\{(name|task_type|version)\}')
+NAMING_PATTERN_ALLOWED_CHARS_RE = re.compile(r'^[A-Za-z0-9_\-\.]*$')
+
+
+MOVIE_FORMATS = {ext.lstrip('.') for ext in file_handler.MOVIE_EXTENSIONS}
+MOVIE_CODECS = {'h264', 'h265', 'mjpeg', 'dnxhd', 'dnxhr', 'prores', 'uncompressed', 'avid', 'cineform'}
+MOVIE_FRAME_RATES = {23.976, 24, 30, 48, 60}
+RESOLUTION_RE = re.compile(r'^\d+x\d+$')
+
+
+class SubmissionTypeConfig(BaseModel):
+    """Submission rules for a single task type.
+
+    All checking against these rules happens client-side (in TaskSubmissions.vue) when an
+    artist picks a file to submit - this schema only validates and stores the configuration
+    itself, it is never used to inspect an uploaded file server-side.
+    """
+    allowed_extensions: List[str] = Field(default_factory=list, description="Accepted file extensions, e.g. ['.mov', '.exr']")
+    naming_pattern: Optional[str] = Field(None, description="Filename pattern using {name}, {task_type}, {version} tokens")
+    check_naming: bool = Field(True, description="Whether the naming pattern is actively checked")
+    required: bool = Field(False, description="Whether a submission is expected for this task type (informational only)")
+    check_movie_spec: bool = Field(False, description="Whether to check video submissions against movie_resolution/movie_format/movie_codec/movie_frame_rate")
+    movie_resolution: Optional[str] = Field(None, description="Required video resolution, e.g. '1920x1080'")
+    movie_format: Optional[str] = Field(None, description="Required video format, e.g. 'mov'")
+    movie_codec: Optional[str] = Field(None, description="Required video codec, e.g. 'h264'")
+    movie_frame_rate: Optional[float] = Field(None, description="Required video frame rate, e.g. 23.976")
+
+    @validator('allowed_extensions')
+    def validate_allowed_extensions(cls, v):
+        normalized = []
+        for ext in v:
+            ext = ext.lower()
+            if not ext.startswith('.'):
+                ext = f'.{ext}'
+            if ext not in file_handler.SUPPORTED_FORMATS:
+                raise ValueError(
+                    f"Extension '{ext}' is not a supported file format. "
+                    f"Supported formats: {', '.join(sorted(file_handler.SUPPORTED_FORMATS))}"
+                )
+            normalized.append(ext)
+        return normalized
+
+    @validator('naming_pattern')
+    def validate_naming_pattern(cls, v):
+        if v is None or v == '':
+            return None
+        # Strip out known tokens, then everything left must be safe literal characters
+        stripped = NAMING_PATTERN_TOKEN_RE.sub('', v)
+        if not NAMING_PATTERN_ALLOWED_CHARS_RE.match(stripped):
+            raise ValueError(
+                'Naming pattern may only contain letters, numbers, "_", "-", "." '
+                'and the tokens {name}, {task_type}, {version}'
+            )
+        return v
+
+    @validator('movie_resolution')
+    def validate_movie_resolution(cls, v):
+        if v is None or v == '':
+            return None
+        if not RESOLUTION_RE.match(v):
+            raise ValueError('Movie resolution must be in format "WIDTHxHEIGHT" (e.g., "1920x1080")')
+        return v
+
+    @validator('movie_format')
+    def validate_movie_format(cls, v):
+        if v is None or v == '':
+            return None
+        v = v.lower().lstrip('.')
+        if v not in MOVIE_FORMATS:
+            raise ValueError(f'Movie format must be one of: {", ".join(sorted(MOVIE_FORMATS))}')
+        return v
+
+    @validator('movie_codec')
+    def validate_movie_codec(cls, v):
+        if v is None or v == '':
+            return None
+        v = v.lower()
+        if v not in MOVIE_CODECS:
+            raise ValueError(f'Movie codec must be one of: {", ".join(sorted(MOVIE_CODECS))}')
+        return v
+
+    @validator('movie_frame_rate')
+    def validate_movie_frame_rate(cls, v):
+        if v is None:
+            return None
+        if not any(abs(v - rate) < 0.001 for rate in MOVIE_FRAME_RATES):
+            raise ValueError(f'Movie frame rate must be one of: {", ".join(str(r) for r in sorted(MOVIE_FRAME_RATES))}')
+        return v
+
+
+class ProjectSubmissionConfig(BaseModel):
+    """Submission configuration for a project, keyed by task type"""
+    config_by_task_type: Dict[str, SubmissionTypeConfig] = Field(default_factory=dict)