Update app labels for billing, writer, and planner models; fix foreign key references in automation migrations

- Set app labels for CreditTransaction and CreditUsageLog models to 'billing'.
- Updated app labels for Tasks, Content, and Images models to 'writer'.
- Changed foreign key references in automation migrations from 'account' to 'tenant' for consistency.

backend/igny8_core/business/content/models.py

@@ -29,7 +29,7 @@ class Tasks(SiteSectorBaseModel):
     description = models.TextField(blank=True, null=True)
     keywords = models.CharField(max_length=500, blank=True)  # Comma-separated keywords (legacy)
     cluster = models.ForeignKey(
-        'planning.Clusters',
+        'planner.Clusters',
         on_delete=models.SET_NULL,
         null=True,
         blank=True,
@@ -37,13 +37,13 @@ class Tasks(SiteSectorBaseModel):
         limit_choices_to={'sector': models.F('sector')}
     )
     keyword_objects = models.ManyToManyField(
-        'planning.Keywords',
+        'planner.Keywords',
         blank=True,
         related_name='tasks',
         help_text="Individual keywords linked to this task"
     )
     idea = models.ForeignKey(
-        'planning.ContentIdeas',
+        'planner.ContentIdeas',
         on_delete=models.SET_NULL,
         null=True,
         blank=True,
@@ -68,6 +68,7 @@ class Tasks(SiteSectorBaseModel):
     updated_at = models.DateTimeField(auto_now=True)
     
     class Meta:
+        app_label = 'writer'
         db_table = 'igny8_tasks'
         ordering = ['-created_at']
         verbose_name = 'Task'
@@ -115,6 +116,7 @@ class Content(SiteSectorBaseModel):
     updated_at = models.DateTimeField(auto_now=True)
     
     class Meta:
+        app_label = 'writer'
         db_table = 'igny8_content'
         ordering = ['-generated_at']
         verbose_name = 'Content'
@@ -172,6 +174,7 @@ class Images(SiteSectorBaseModel):
     updated_at = models.DateTimeField(auto_now=True)
     
     class Meta:
+        app_label = 'writer'
         db_table = 'igny8_images'
         ordering = ['content', 'position', '-created_at']
         verbose_name = 'Image'