Stage 07.1 - auto trading skeleton UI, state machine and mock controls

app/src/trading/auto/service.py

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+# app/src/trading/auto/service.py
+
+from __future__ import annotations
+
+from src.core.config import load_settings
+from src.trading.auto.state import AutoTradeState
+
+
+class AutoTradeService:
+    _state = AutoTradeState()
+
+    def get_state(self) -> AutoTradeState:
+        if not self._state.symbol:
+            self._state.symbol = load_settings().default_symbol
+
+        return self._state
+
+    def start(self) -> tuple[AutoTradeState, str]:
+        state = self.get_state()
+
+        if state.status == "RUNNING":
+            return state, "Автоторговля уже активна."
+
+        if state.status == "OBSERVING":
+            state.status = "RUNNING"
+            return state, "Автоторговля активирована."
+
+        state.status = "RUNNING"
+        return state, "Автоторговля запущена."
+
+    def observe(self) -> tuple[AutoTradeState, str]:
+        state = self.get_state()
+        previous_status = state.status
+
+        if previous_status == "OBSERVING":
+            return state, "Режим наблюдения уже включён."
+
+        state.status = "OBSERVING"
+
+        if previous_status == "OFF":
+            return state, "Включён режим наблюдения."
+
+        return state, "Автоторговля переведена в режим наблюдения."
+
+    def stop(self) -> tuple[AutoTradeState, str]:
+        state = self.get_state()
+
+        if state.status == "OFF":
+            return state, "Автоторговля уже выключена."
+
+        state.status = "OFF"
+        return state, "Автоторговля выключена."

app/src/trading/auto/state.py

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+# app/src/trading/auto/state.py
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+@dataclass(slots=True)
+class AutoTradeState:
+    status: str = "OFF"
+    strategy: str | None = None
+    symbol: str = ""
+    risk_percent: float | None = None
+    pnl_usd: float = 0.0