Add config file support for hook backend URL

Hooks now read backend URL from ~/.claude/monitor_url config file,
making it easier to configure for remote/VM deployments without
relying on environment variables.

Priority order:
1. Config file (~/.claude/monitor_url)
2. Environment variable (CLAUDE_MONITOR_URL)
3. Default (http://localhost:8000)

This fixes the issue where Claude Code doesn't see environment
variables when not started from a configured shell.

Usage:
  echo "http://your-vm:8000" > ~/.claude/monitor_url
  cp .claude/hooks/*.sh ~/.claude/hooks/
  chmod +x ~/.claude/hooks/*.sh

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.claude/hooks/configure.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# Configure Claude Code Monitor hooks with custom backend URL
+
+set -e
+
+# Get backend URL from user or use localhost
+read -p "Enter backend URL (default: http://localhost:8000): " BACKEND_URL
+BACKEND_URL=${BACKEND_URL:-http://localhost:8000}
+
+echo "Configuring hooks to use: $BACKEND_URL"
+
+# Create temporary directory
+TEMP_DIR=$(mktemp -d)
+trap "rm -rf $TEMP_DIR" EXIT
+
+# Copy hooks to temp directory
+cp *.sh "$TEMP_DIR/"
+
+# Update each hook with the configured URL
+for hook in "$TEMP_DIR"/*.sh; do
+    if [ -f "$hook" ] && [ "$(basename "$hook")" != "configure.sh" ]; then
+        # Replace the MONITOR_URL line with hardcoded URL
+        sed -i.bak "s|MONITOR_URL=\"\${CLAUDE_MONITOR_URL:-http://localhost:8000}\"|MONITOR_URL=\"$BACKEND_URL\"|g" "$hook"
+        rm -f "${hook}.bak"
+    fi
+done
+
+# Install to ~/.claude/hooks/
+mkdir -p ~/.claude/hooks
+cp "$TEMP_DIR"/*.sh ~/.claude/hooks/
+chmod +x ~/.claude/hooks/*.sh
+
+echo "✓ Hooks installed and configured successfully!"
+echo "✓ Backend URL: $BACKEND_URL"
+echo ""
+echo "Test with:"
+echo "  echo '{\"session_id\":\"test\",\"timestamp\":1234567890}' | ~/.claude/hooks/session_start.sh"