chore: update file permissions to executable across repository

- Change file mode from 644 to 755 for all project files
- Add chain_id parameter to get_balance RPC endpoint with default "ait-devnet"
- Rename Miner.extra_meta_data to extra_metadata for consistency

Dockerfile

@@ -0,0 +1,66 @@
+# Multi-stage build for AITBC CLI
+FROM python:3.13-slim as builder
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    gcc \
+    g++ \
+    make \
+    libffi-dev \
+    libssl-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements
+COPY cli/requirements.txt .
+COPY cli/requirements-dev.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -r requirements.txt && \
+    pip install --no-cache-dir -r requirements-dev.txt
+
+# Copy CLI source code
+COPY cli/ .
+
+# Install CLI in development mode
+RUN pip install -e .
+
+# Production stage
+FROM python:3.13-slim as production
+
+# Create non-root user
+RUN useradd --create-home --shell /bin/bash aitbc
+
+# Set working directory
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apt-get update && apt-get install -y \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy CLI from builder stage
+COPY --from=builder /usr/local/lib/python3.13/site-packages /usr/local/lib/python3.13/site-packages
+COPY --from=builder /usr/local/bin /usr/local/bin
+
+# Create data directories
+RUN mkdir -p /home/aitbc/.aitbc && \
+    chown -R aitbc:aitbc /home/aitbc
+
+# Switch to non-root user
+USER aitbc
+
+# Set environment variables
+ENV PATH=/home/aitbc/.local/bin:$PATH
+ENV PYTHONPATH=/app
+ENV AITBC_DATA_DIR=/home/aitbc/.aitbc
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -m aitbc_cli.main --version || exit 1
+
+# Default command
+CMD ["python", "-m", "aitbc_cli.main", "--help"]