docs: add DOCKER_GUIDE.md and fix .env parsing; chore: update docker and script configurations

config/ping_pong_config.yaml

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+# Ping-Pong Strategy Configuration
+
+# Trading Pair & Timeframe
+symbol: BTCUSDT
+interval: "1"  # Minutes (1, 3, 5, 15, 30, 60, 120, 240, 360, 720, D, W, M)
+
+# Indicator Settings
+rsi:
+  period: 14
+  overbought: 70
+  oversold: 30
+  enabled_for_open: true
+  enabled_for_close: false
+
+hurst:
+  period: 30
+  multiplier: 1.8
+  enabled_for_open: true
+  enabled_for_close: false
+
+# Strategy Settings
+direction: "long"  # "long" or "short"
+capital: 1000.0    # Initial capital for calculations (informational)
+exchange_leverage: 1.0  # Multiplier for each 'ping' size
+max_effective_leverage: 5.0  # Cap on total position size relative to equity
+pos_size_margin: 10.0  # Margin per 'ping' (USD)
+take_profit_pct: 1.5   # Target profit percentage per exit (1.5 = 1.5%)
+partial_exit_pct: 0.15 # 15% of position closed on each TP hit
+min_position_value_usd: 15.0 # Minimum remaining value to keep position open
+
+# Execution Settings
+loop_interval_seconds: 5 # How often to check for new data
+debug_mode: false