Add organization and task queue features

- Introduced new models for `Organization` and `ReviewTask` to manage organizations and review tasks.
- Implemented API endpoints for CRUD operations on organizations and tasks, including scanning organizations for repositories and PRs.
- Developed a background worker for sequential processing of review tasks with priority handling and automatic retries.
- Created frontend components for managing organizations and monitoring task queues, including real-time updates and filtering options.
- Added comprehensive documentation for organization features and quick start guides.
- Fixed UI issues and improved navigation for better user experience.

backend/app/models/organization.py

@@ -0,0 +1,38 @@
+"""Organization model"""
+
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, JSON, Enum
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+from datetime import datetime
+import enum
+
+from app.database import Base
+
+
+class OrganizationPlatformEnum(str, enum.Enum):
+    """Git platform types"""
+    GITEA = "gitea"
+    GITHUB = "github"
+    BITBUCKET = "bitbucket"
+
+
+class Organization(Base):
+    """Organization model for tracking Git organizations"""
+    
+    __tablename__ = "organizations"
+    
+    id = Column(Integer, primary_key=True, index=True)
+    name = Column(String, nullable=False)  # Имя организации
+    platform = Column(Enum(OrganizationPlatformEnum), nullable=False)
+    base_url = Column(String, nullable=False)  # https://git.example.com
+    api_token = Column(String, nullable=True)  # Encrypted, optional (uses master token)
+    webhook_secret = Column(String, nullable=False)
+    config = Column(JSON, default=dict)  # Review configuration
+    is_active = Column(Boolean, default=True)
+    last_scan_at = Column(DateTime, nullable=True)  # Когда последний раз сканировали
+    created_at = Column(DateTime, default=datetime.utcnow, server_default=func.now())
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, server_default=func.now())
+    
+    def __repr__(self):
+        return f"<Organization(id={self.id}, name={self.name}, platform={self.platform})>"
+