Initial commit: StackPilot Phase 1 (Core)

Self-hosted Docker Compose manager.
- Backend: FastAPI + docker-py + SQLite (JWT auth, file-first stacks,
  lifecycle, live status, WebSocket logs, docker-run converter, audit log)
- Frontend: React + Vite + Tailwind (login/setup, dashboard, stacks,
  stack detail, Monaco editor, dark/light theme)
- Deployment: docker-compose.yml, Dockerfiles, nginx reverse proxy

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/models/stack.py

@@ -0,0 +1,49 @@
+from __future__ import annotations
+
+from datetime import datetime, timezone
+from typing import Optional
+
+from sqlmodel import Field, SQLModel
+
+
+def _now() -> datetime:
+    return datetime.now(timezone.utc)
+
+
+class Stack(SQLModel, table=True):
+    # id is the stack directory name (slug)
+    id: str = Field(primary_key=True)
+    name: str
+    description: Optional[str] = None
+    stacks_dir_override: Optional[str] = None
+    created_at: datetime = Field(default_factory=_now)
+    updated_at: datetime = Field(default_factory=_now)
+
+
+# --- API schemas ---
+
+
+class StackCreate(SQLModel):
+    name: str
+    description: Optional[str] = None
+    yaml: Optional[str] = None  # initial compose content
+    env: Optional[str] = None
+
+
+class StackUpdate(SQLModel):
+    name: Optional[str] = None
+    description: Optional[str] = None
+    yaml: Optional[str] = None
+    env: Optional[str] = None
+
+
+class StackCloneRequest(SQLModel):
+    name: str
+
+
+class ConvertRequest(SQLModel):
+    command: str  # a `docker run ...` string
+
+
+class ConvertResponse(SQLModel):
+    yaml: str