Phase 2: Chat & AI Core — Claude API streaming, chat UI, admin context

Backend:
- Chat, Message, ContextFile models + Alembic migration
- Chat CRUD with per-user limit enforcement (max_chats)
- SSE streaming endpoint: saves user message, streams Claude response,
  saves assistant message with token usage metadata
- Context assembly: primary context file + conversation history
- Admin context CRUD (GET/PUT with version tracking)
- Anthropic SDK integration with async streaming
- Chat ownership isolation (users can't access each other's chats)

Frontend:
- Chat page with sidebar chat list + main chat window
- Real-time SSE streaming via fetch + ReadableStream
- Message bubbles with Markdown rendering (react-markdown)
- Auto-growing message input (Enter to send, Shift+Enter newline)
- Zustand chat store for streaming state management
- Admin primary context editor with unsaved changes warning
- Updated routing: /chat, /chat/:chatId, /admin/context
- Enabled Chat and Admin sidebar navigation
- English + Russian translations for all new UI

Infrastructure:
- nginx: disabled proxy buffering for SSE support
- Added ANTHROPIC_API_KEY and CLAUDE_MODEL to config

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/models/__init__.py

@@ -1,4 +1,7 @@
 from app.models.user import User
 from app.models.session import Session
+from app.models.chat import Chat
+from app.models.message import Message
+from app.models.context_file import ContextFile
 
-__all__ = ["User", "Session"]
+__all__ = ["User", "Session", "Chat", "Message", "ContextFile"]

backend/app/models/chat.py

@@ -0,0 +1,25 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import Boolean, DateTime, ForeignKey, String, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class Chat(Base):
+    __tablename__ = "chats"
+
+    user_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
+    )
+    title: Mapped[str] = mapped_column(String(255), nullable=False, default="New Chat")
+    skill_id: Mapped[uuid.UUID | None] = mapped_column(UUID(as_uuid=True), nullable=True)
+    is_archived: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
+    )
+
+    user: Mapped["User"] = relationship(back_populates="chats")  # noqa: F821
+    messages: Mapped[list["Message"]] = relationship(back_populates="chat", cascade="all, delete-orphan")  # noqa: F821

backend/app/models/context_file.py

@@ -0,0 +1,26 @@
+import uuid
+from datetime import datetime
+
+from sqlalchemy import DateTime, ForeignKey, Integer, String, Text, UniqueConstraint, func
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.database import Base
+
+
+class ContextFile(Base):
+    __tablename__ = "context_files"
+    __table_args__ = (UniqueConstraint("type", "user_id", name="uq_context_files_type_user"),)
+
+    type: Mapped[str] = mapped_column(String(20), nullable=False)
+    user_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("users.id", ondelete="CASCADE"), nullable=True
+    )
+    content: Mapped[str] = mapped_column(Text, nullable=False, default="")
+    version: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
+    updated_by: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("users.id", ondelete="SET NULL"), nullable=True
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
+    )

backend/app/models/message.py

@@ -0,0 +1,20 @@
+import uuid
+
+from sqlalchemy import ForeignKey, String, Text
+from sqlalchemy.dialects.postgresql import JSONB, UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.database import Base
+
+
+class Message(Base):
+    __tablename__ = "messages"
+
+    chat_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("chats.id", ondelete="CASCADE"), nullable=False, index=True
+    )
+    role: Mapped[str] = mapped_column(String(20), nullable=False)
+    content: Mapped[str] = mapped_column(Text, nullable=False)
+    metadata_: Mapped[dict | None] = mapped_column("metadata", JSONB, nullable=True)
+
+    chat: Mapped["Chat"] = relationship(back_populates="messages")  # noqa: F821

backend/app/models/user.py

@@ -25,3 +25,4 @@ class User(Base):
     )
 
     sessions: Mapped[list["Session"]] = relationship(back_populates="user", cascade="all, delete-orphan")  # noqa: F821
+    chats: Mapped[list["Chat"]] = relationship(back_populates="user", cascade="all, delete-orphan")  # noqa: F821