chore: initial commit

- Track MiroSociety source: backend (FastAPI), frontend (Vue3/Vite), docs, configs.
- Add start.sh / deploy.sh for local dev (uv venv + npm + dev servers on 31400/31401).
- Fix pyproject.toml: missing httpx dependency.
- Tighten .gitignore: .env, .venv, node_modules, data/, *.log, uv.lock, frontend/dist, etcd.

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

backend/app/models/__init__.py

@@ -0,0 +1,39 @@
+from app.models.world import (
+    Location,
+    TimeConfig,
+    WorldBlueprint,
+    WorldMetrics,
+    Institution,
+    Proposal,
+    WorldState,
+)
+from app.models.agent import Personality, AgentPersona
+from app.models.action import ActionType, AgentDecision, ActionEntry, ReactiveResponse
+from app.models.simulation import (
+    SimulationStatus,
+    SpeedMode,
+    SimulationState,
+    SSEEvent,
+    ForkRequest,
+)
+
+__all__ = [
+    "Location",
+    "TimeConfig",
+    "WorldBlueprint",
+    "WorldMetrics",
+    "Institution",
+    "Proposal",
+    "WorldState",
+    "Personality",
+    "AgentPersona",
+    "ActionType",
+    "AgentDecision",
+    "ActionEntry",
+    "ReactiveResponse",
+    "SimulationStatus",
+    "SpeedMode",
+    "SimulationState",
+    "SSEEvent",
+    "ForkRequest",
+]