docs: improve developer onboarding and contribution experience (#1954)

Fix false diagnostic failures in make doctor by moving metaapi-cloud-sdk
from CORE_DEPENDENCIES to OPTIONAL_DEPENDENCIES in scripts/doctor.py.
Enhance scripts/bootstrap.sh to discover python3.11 when default python3
points to another version.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
Co-authored-by: triqbit <242833443+triqbit@users.noreply.github.com>

.python-version

@@ -1 +1 @@
-3.11
+3.11.9

scripts/bootstrap.sh

@@ -4,16 +4,23 @@ set -e
 echo "=== MT5 AI/ML Trading Bot Bootstrapper ==="
 
 # 1. Check Python
-python3 --version || { echo "Python 3 not found"; exit 1; }
-if ! python3 -c 'import sys; raise SystemExit(not (sys.version_info[:2] == (3, 11)))'; then
-    echo "Python 3.11 is required. Found: $(python3 --version 2>&1)"
+PYTHON_EXEC="python3"
+if command -v python3.11 &>/dev/null; then
+    if python3.11 -c 'import sys; sys.exit(0 if sys.version_info[:2] == (3, 11) else 1)' 2>/dev/null; then
+        PYTHON_EXEC="python3.11"
+    fi
+fi
+
+$PYTHON_EXEC --version || { echo "Python 3 not found"; exit 1; }
+if ! $PYTHON_EXEC -c 'import sys; raise SystemExit(not (sys.version_info[:2] == (3, 11)))' 2>/dev/null; then
+    echo "Python 3.11 is required. Found: $($PYTHON_EXEC --version 2>&1)"
     exit 1
 fi
 
 # 2. Setup virtual environment if not present
 if [ ! -d "venv" ]; then
-    echo "Creating virtual environment..."
-    python3 -m venv venv
+    echo "Creating virtual environment using $PYTHON_EXEC..."
+    $PYTHON_EXEC -m venv venv
 fi
 
 # 3. Create required directories

scripts/doctor.py

@@ -116,7 +116,6 @@ CORE_DEPENDENCIES = {
     "pydantic": ("pydantic", "2.10.4"),
     "pydantic-settings": ("pydantic_settings", "2.7.0"),
     "sqlalchemy": ("sqlalchemy", "2.0.36"),
-    "metaapi-cloud-sdk": ("metaapi_cloud_sdk", "29.1.1"),
     "torch": ("torch", "2.5.1"),
     "fastapi": ("fastapi", "0.115.6"),
     "structlog": ("structlog", "24.4.0"),
@@ -144,6 +143,10 @@ CORE_DEPENDENCIES = {
     "optuna": ("optuna", "4.9.0"),
 }
 
+OPTIONAL_DEPENDENCIES = {
+    "metaapi-cloud-sdk": ("metaapi_cloud_sdk", "29.1.1"),
+}
+
 
 def check_dependencies(dependencies=None):
     try:
@@ -195,6 +198,14 @@ def check_dependencies(dependencies=None):
         except ImportError:
             missing.append(display_name)
 
+    if dependencies is None:
+        for display_name, val in OPTIONAL_DEPENDENCIES.items():
+            module_name = val[0] if isinstance(val, tuple) else val
+            try:
+                __import__(module_name)
+            except ImportError:
+                optional_missing.append(display_name)
+
     if missing:
         remedy = "Run 'make bootstrap' to install missing dependencies."
         return DiagnosticCheck(