feat: add Evotor OAuth connection feature with formatted phone input

- Add EvotorConnection model to store user's Evotor access tokens
- Implement OAuth 2.0 flow: /evotor (view), /evotor/connect, /evotor/callback, /evotor/disconnect
- Add Evotor connection page with connected/disconnected states
- Implement phone input masking (+7 (XXX) XXX-XX-XX) using Inputmask
- Add Russian validation messages for form fields
- Update phone validator to match masked format
- Add httpx dependency for async OAuth token exchange
- Add Evotor settings to config: CLIENT_ID, CLIENT_SECRET, SCOPES

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

web/models.py

@@ -1,4 +1,5 @@
-from sqlalchemy import Column, Integer, String, Boolean, DateTime
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Text
+from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
 
 from web.database import Base
@@ -19,3 +20,19 @@ class User(Base):
     password_reset_expires = Column(DateTime, nullable=True)
     created_at = Column(DateTime, server_default=func.now(), nullable=False)
     updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now(), nullable=False)
+
+    evotor_connection = relationship("EvotorConnection", back_populates="user", uselist=False)
+
+
+class EvotorConnection(Base):
+    __tablename__ = "evotor_connections"
+
+    id = Column(Integer, primary_key=True, autoincrement=True)
+    user_id = Column(Integer, ForeignKey("users.id", ondelete="CASCADE"), unique=True, nullable=False)
+    access_token = Column(Text, nullable=False)
+    store_id = Column(String(255), nullable=True)
+    store_name = Column(String(255), nullable=True)
+    connected_at = Column(DateTime, server_default=func.now(), nullable=False)
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now(), nullable=False)
+
+    user = relationship("User", back_populates="evotor_connection")