Add per-project Department management

Departments are now a customizable per-project list (standard + custom),
matching the existing custom task type/status pattern, instead of a fixed
7-value enum. They're usable directly on tasks (new field, independent of
assignee) and continue to drive team member department roles.

backend/schemas/project.py

@@ -5,7 +5,6 @@ from enum import Enum
 import re
 
 from models.project import ProjectStatus, ProjectType
-from models.user import DepartmentRole
 
 
 # Technical Specifications Schemas
@@ -67,16 +66,6 @@ class ProjectTechnicalSpecs(BaseModel):
             raise ValueError('Delivery image resolution must be in format "WIDTHxHEIGHT" (e.g., "1920x1080")')
         return v
 
-    @validator('delivery_movie_specs_by_department')
-    def validate_delivery_movie_specs_by_department(cls, v):
-        if v is None:
-            return {}
-        allowed_departments = ['layout', 'animation', 'lighting', 'composite', 'modeling', 'rigging', 'surfacing']
-        for dept in v.keys():
-            if dept not in allowed_departments:
-                raise ValueError(f'Department must be one of: {", ".join(allowed_departments)}')
-        return v
-
 
 # Default delivery movie specifications per department
 DEFAULT_DELIVERY_MOVIE_SPECS = {
@@ -135,17 +124,6 @@ class ProjectBase(BaseModel):
             raise ValueError('Delivery image resolution must be in format "WIDTHxHEIGHT" (e.g., "1920x1080")')
         return v
 
-    @validator('delivery_movie_specs_by_department')
-    def validate_delivery_movie_specs_by_department(cls, v):
-        if v is None:
-            return {}
-        allowed_departments = ['layout', 'animation', 'lighting', 'composite', 'modeling', 'rigging', 'surfacing']
-        for dept in v.keys():
-            if dept not in allowed_departments:
-                raise ValueError(f'Department must be one of: {", ".join(allowed_departments)}')
-        return v
-
-
 class ProjectCreate(ProjectBase):
     pass
 
@@ -178,20 +156,9 @@ class ProjectUpdate(BaseModel):
             raise ValueError('Delivery image resolution must be in format "WIDTHxHEIGHT" (e.g., "1920x1080")')
         return v
 
-    @validator('delivery_movie_specs_by_department')
-    def validate_delivery_movie_specs_by_department(cls, v):
-        if v is None:
-            return v
-        allowed_departments = ['layout', 'animation', 'lighting', 'composite', 'modeling', 'rigging', 'surfacing']
-        for dept in v.keys():
-            if dept not in allowed_departments:
-                raise ValueError(f'Department must be one of: {", ".join(allowed_departments)}')
-        return v
-
-
 class ProjectMemberBase(BaseModel):
     user_id: int
-    department_role: Optional[DepartmentRole] = None
+    department_role: Optional[str] = None
 
 
 class ProjectMemberCreate(ProjectMemberBase):
@@ -199,7 +166,7 @@ class ProjectMemberCreate(ProjectMemberBase):
 
 
 class ProjectMemberUpdate(BaseModel):
-    department_role: Optional[DepartmentRole] = None
+    department_role: Optional[str] = None
 
 
 class ProjectMemberResponse(ProjectMemberBase):