feat(core): add core module with mixins, services, and background jobs

- Add Model Mixins: TimestampMixin, SoftDeleteMixin, AuditMixin, etc.
- Add Base Services: BaseService, BulkOperationsMixin, QueryOptimizerMixin
- Add Base ViewSets with bulk operations
- Add BackgroundJob model for Celery task tracking
- Add BaseAppCommand for management commands
- Add permissions, pagination, filters, cache, logging
- Migrate tests to factory_boy + faker
- Add CHANGELOG.md
- 297 tests passing

.pre-commit-config.yaml

@@ -5,17 +5,17 @@ repos:
       - id: ruff
         name: ruff lint (src only)
         files: ^src/.*\.py$
-        args: [--config=ruff.toml, --fix, --exit-non-zero-on-fix]
+        args: [--fix, --exit-non-zero-on-fix]
         exclude: |
           (?x)^(
               src/.*/migrations/.*|
               src/.*/__pycache__/.*
           )$
-      
+
       - id: ruff-format
         name: ruff format (src only)
         files: ^src/.*\.py$
-        args: [--config=ruff.toml]
+        args: []
         exclude: |
           (?x)^(
               src/.*/migrations/.*|
@@ -28,18 +28,18 @@ repos:
       - id: trailing-whitespace
         name: check trailing whitespace (src only)
         files: ^src/.*\.(py|txt|md|yaml|yml)$
-      
+
       - id: end-of-file-fixer
         name: fix end of file (src only)
         files: ^src/.*\.(py|txt|md|yaml|yml)$
-      
+
       - id: check-yaml
         name: check yaml syntax (src only)
         files: ^src/.*\.ya?ml$
-      
+
       - id: check-added-large-files
         name: check large files
-        args: ['--maxkb=500']
+        args: ["--maxkb=500"]
 
   - repo: local
     hooks:
@@ -53,4 +53,4 @@ repos:
           (?x)^(
               src/.*/migrations/.*|
               src/.*/__pycache__/.*
-          )$
+          )$