feat: Implement multi-tenancy support in middleware and security layers

- Enhanced TenantMiddleware to validate tenant information from JWT tokens.
- Added LicenseValidationMiddleware to check tenant licenses before processing requests.
- Updated security utilities to extract tenant information from tokens and validate company access.
- Introduced CompanyStore to manage active company state and handle company switching in the frontend.
- Modified API routes to include company_id in requests for better resource management.
- Improved logging and error handling throughout the middleware and API layers.
- Updated frontend components to reflect changes in company management and selection.
- Added new API route for fetching user's companies with proper authentication handling.

backend/api/v1/modules/a76/fraction_rule_octave/services.py

@@ -5,14 +5,21 @@ from . import models, dto
 Service layer for FractionRuleOctave.
 """
 
+
 class FractionRuleOctaveService:
     @staticmethod
-    def get_fraction_by_permission_line(db: Session, permission: str, line: int, fraction: str):
-        return db.query(models.FractionRuleOctave).filter(
-            models.FractionRuleOctave.permission == permission,
-            models.FractionRuleOctave.line == line,
-            models.FractionRuleOctave.fraction == fraction
-        ).first()
+    def get_fraction_by_permission_line(
+        db: Session, permission: str, line: int, fraction: str
+    ):
+        return (
+            db.query(models.FractionRuleOctave)
+            .filter(
+                models.FractionRuleOctave.permission == permission,
+                models.FractionRuleOctave.line == line,
+                models.FractionRuleOctave.fraction == fraction,
+            )
+            .first()
+        )
 
     @staticmethod
     def create_frac(db: Session, frac_data: dto.FractionRuleOctaveCreateDTO):
@@ -24,8 +31,10 @@ class FractionRuleOctaveService:
 
     @staticmethod
     def delete_fraction(db: Session, permission: str, line: int, fraction: str):
-        frac = FractionRuleOctaveService.get_fraction_by_permission_line(db, permission, line, fraction)
+        frac = FractionRuleOctaveService.get_fraction_by_permission_line(
+            db, permission, line, fraction
+        )
         if frac:
             db.delete(frac)
             db.commit()
-        return frac
+        return frac