Chore: rework devcontainer setup and clean up development environment

.devcontainer/Dockerfile

@@ -0,0 +1,3 @@
+FROM mcr.microsoft.com/devcontainers/python:3.11
+
+RUN pip install --upgrade pip setuptools wheel

.devcontainer/devcontainer.json

@@ -1,26 +1,18 @@
 {
-  "name": "trading-platform devcontainer",
-  "dockerComposeFile": [
-    "../docker-compose.yaml",
-    "../docker-compose.override.yaml"
-  ],
-  "service": "app",
-  "workspaceFolder": "/workspace/trading-platform",
-  "remoteUser": "root",
+  "name": "Trading Platform Dev",
+  "build": {
+    "dockerfile": "Dockerfile",
+    "context": ".."
+  },
+
+  "postCreateCommand": "pip install -e .[dev]",
+
   "customizations": {
     "vscode": {
-      "settings": {
-        "python.defaultInterpreterPath": "/opt/venv/bin/python",
-        "python.testing.pytestEnabled": true,
-        "python.testing.pytestArgs": [
-          "tests"
-        ]
-      },
       "extensions": [
         "ms-python.python",
         "ms-python.debugpy"
       ]
     }
-  },
-  "postCreateCommand": "/bin/bash scripts/post-create.sh"
-}
+  }
+}

examples/local/backtest.py

@@ -4,9 +4,15 @@
 
 import argparse
 import json
+import sys
 from pathlib import Path
 from typing import TYPE_CHECKING
 
+# Enable importing plugin-style modules outside the core package (e.g. examples/)
+if __name__ == "__main__" or True:
+    PROJECT_ROOT = Path(__file__).resolve().parents[2]
+    sys.path.insert(0, str(PROJECT_ROOT))
+
 if TYPE_CHECKING:
     from trading_platform import BacktestResult
 

examples/local/local.json

@@ -5,9 +5,9 @@
   "engine": {
     "initial_snapshot": null,
     "data_files": [
-      "/workspace/trading-platform/tests/data/parts/part-000.npz",
-      "/workspace/trading-platform/tests/data/parts/part-001.npz",
-      "/workspace/trading-platform/tests/data/parts/part-002.npz"
+      "/workspaces/trading-platform/tests/data/parts/part-000.npz",
+      "/workspaces/trading-platform/tests/data/parts/part-001.npz",
+      "/workspaces/trading-platform/tests/data/parts/part-002.npz"
     ],
 
     "instrument": "BTC_USDC-PERPETUAL",
@@ -32,8 +32,8 @@
     "roi_lb": 40000,
     "roi_ub": 80000,
 
-    "stats_npz_path": "/workspace/trading-platform/tests/data/results/stats.npz",
-    "event_bus_path": "/workspace/trading-platform/tests/data/results/events.json"
+    "stats_npz_path": "/workspaces/trading-platform/tests/data/results/stats.npz",
+    "event_bus_path": "/workspaces/trading-platform/tests/data/results/events.json"
   },
 
   "risk": {