feat: rewrite setup.sh as menu-driven installer with profile system

Replace the linear setup.sh with an interactive menu-driven installer:
- First-time wizard with OS detection and profile selection
- Install profiles: Core SIGINT, Maritime, Weather, RF Security, Full, Custom
- System health check (tools, SDR devices, ports, permissions, venv, PostgreSQL)
- Automated PostgreSQL setup for ADS-B history (creates DB, user, tables, indexes)
- Environment configurator for interactive INTERCEPT_* variable editing
- Update tools (rebuild source-built binaries)
- Uninstall/cleanup with granular options and double-confirm for destructive ops
- View status table of all tools with installed/missing state
- CLI flags: --non-interactive, --profile=, --health-check, --postgres-setup, --menu
- .env file helpers (read/write) with start.sh auto-sourcing
- Bash 3.2 compatible (no associative arrays) for macOS support

Update all documentation to reflect the new menu system:
- README.md: installation section with profiles, CLI flags, env config, health check
- CLAUDE.md: entry points and local setup commands
- docs/index.html: GitHub Pages install cards with profile mentions
- docs/HARDWARE.md: setup script section with profile table
- docs/TROUBLESHOOTING.md: health check and profile-based install guidance
- docs/DISTRIBUTED_AGENTS.md: controller quick start

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -25,14 +25,25 @@ docker compose --profile basic up -d --build
 
 ### Local Setup (Alternative)
 ```bash
-# Initial setup (installs dependencies and configures SDR tools)
+# First-time setup (interactive wizard with install profiles)
 ./setup.sh
 
+# Or headless full install
+./setup.sh --non-interactive
+
+# Or install specific profiles
+./setup.sh --profile=core,weather
+
 # Run with production server (gunicorn + gevent, handles concurrent SSE/WebSocket)
 sudo ./start.sh
 
 # Or for quick local dev (Flask dev server)
 sudo -E venv/bin/python intercept.py
+
+# Other setup utilities
+./setup.sh --health-check      # Verify installation
+./setup.sh --postgres-setup    # Set up ADS-B history database
+./setup.sh --menu              # Force interactive menu
 ```
 
 ### Testing
@@ -68,7 +79,8 @@ mypy .
 ## Architecture
 
 ### Entry Points
-- `start.sh` - Production startup script (gunicorn + gevent auto-detection, CLI flags, HTTPS, fallback to Flask dev server)
+- `setup.sh` - Menu-driven installer with profile system (wizard, health check, PostgreSQL setup, env configurator, update, uninstall). Sources `.env` on startup via `start.sh`.
+- `start.sh` - Production startup script (gunicorn + gevent auto-detection, CLI flags, HTTPS, `.env` sourcing, fallback to Flask dev server)
 - `intercept.py` - Direct Flask dev server entry point (quick local development)
 - `app.py` - Flask application initialization, global state management, process lifecycle, SSE streaming infrastructure, conditional gevent monkey-patch