Add pyproject.toml for consolidated project configuration and replace Black, isort, and Flake8 with Ruff

- Introduced `pyproject.toml` to centralize backend tool configurations (e.g., Ruff, mypy, coverage, pytest).
- Replaced Black, isort, and Flake8 with Ruff for linting, formatting, and import sorting.
- Updated `requirements.txt` to include Ruff and remove replaced tools.
- Added `Makefile` to streamline development workflows with commands for linting, formatting, type-checking, testing, and cleanup.

backend/app/models/user_organization.py

@@ -1,7 +1,7 @@
 # app/models/user_organization.py
 from enum import Enum as PyEnum
 
-from sqlalchemy import Column, ForeignKey, Boolean, String, Index, Enum
+from sqlalchemy import Boolean, Column, Enum, ForeignKey, Index, String
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import relationship
 
@@ -14,6 +14,7 @@ class OrganizationRole(str, PyEnum):
     These provide a baseline role system that can be optionally used.
     Projects can extend this or implement their own permission system.
     """
+
     OWNER = "owner"  # Full control over organization
     ADMIN = "admin"  # Can manage users and settings
     MEMBER = "member"  # Regular member with standard access
@@ -25,25 +26,41 @@ class UserOrganization(Base, TimestampMixin):
     Junction table for many-to-many relationship between Users and Organizations.
     Includes role information for flexible RBAC.
     """
-    __tablename__ = 'user_organizations'
 
-    user_id = Column(PGUUID(as_uuid=True), ForeignKey('users.id', ondelete='CASCADE'), primary_key=True)
-    organization_id = Column(PGUUID(as_uuid=True), ForeignKey('organizations.id', ondelete='CASCADE'), primary_key=True)
+    __tablename__ = "user_organizations"
 
-    role = Column(Enum(OrganizationRole), default=OrganizationRole.MEMBER, nullable=False, index=True)
+    user_id = Column(
+        PGUUID(as_uuid=True),
+        ForeignKey("users.id", ondelete="CASCADE"),
+        primary_key=True,
+    )
+    organization_id = Column(
+        PGUUID(as_uuid=True),
+        ForeignKey("organizations.id", ondelete="CASCADE"),
+        primary_key=True,
+    )
+
+    role = Column(
+        Enum(OrganizationRole),
+        default=OrganizationRole.MEMBER,
+        nullable=False,
+        index=True,
+    )
     is_active = Column(Boolean, default=True, nullable=False, index=True)
 
     # Optional: Custom permissions override for specific users
-    custom_permissions = Column(String(500), nullable=True)  # JSON array of permission strings
+    custom_permissions = Column(
+        String(500), nullable=True
+    )  # JSON array of permission strings
 
     # Relationships
     user = relationship("User", back_populates="user_organizations")
     organization = relationship("Organization", back_populates="user_organizations")
 
     __table_args__ = (
-        Index('ix_user_org_user_active', 'user_id', 'is_active'),
-        Index('ix_user_org_org_active', 'organization_id', 'is_active'),
-        Index('ix_user_org_role', 'role'),
+        Index("ix_user_org_user_active", "user_id", "is_active"),
+        Index("ix_user_org_org_active", "organization_id", "is_active"),
+        Index("ix_user_org_role", "role"),
     )
 
     def __repr__(self):