feat: add image_path to recipe/subtask and user password change API

- Recipe model: add image_path field for recipe-level image
- RecipeSubtask model: add image_path for per-subtask detail images
- Schemas: add image_path to create/update/response for recipe and subtask
- Task router: pass image_path when creating tasks and subtasks
- Recipe service: copy image_path in versioning and update-in-place
- Users router: add PUT /{user_id}/password endpoint (admin only)
- User schema: add UserPasswordChange model

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/schemas/recipe.py

@@ -13,6 +13,7 @@ class RecipeCreate(BaseModel):
     code: str = Field(..., min_length=1, max_length=100)
     name: str = Field(..., min_length=1, max_length=255)
     description: Optional[str] = None
+    image_path: Optional[str] = Field(None, max_length=500)
     # Optional task-level fields for the initial technical drawing
     file_path: Optional[str] = Field(None, max_length=500)
     file_type: Optional[str] = Field(None, pattern="^(image|pdf)$")
@@ -23,6 +24,7 @@ class RecipeUpdate(BaseModel):
     """Schema for updating a recipe (creates new version)."""
     name: Optional[str] = Field(None, min_length=1, max_length=255)
     description: Optional[str] = None
+    image_path: Optional[str] = Field(None, max_length=500)
     change_notes: Optional[str] = None
     # Task-level fields: saved to the first task of the new version
     file_path: Optional[str] = Field(None, max_length=500)
@@ -52,6 +54,7 @@ class RecipeResponse(BaseModel):
     code: str
     name: str
     description: Optional[str] = None
+    image_path: Optional[str] = None
     created_by: int
     created_at: datetime
     active: bool