Add multi-SDR hardware support (LimeSDR, HackRF) and setup script

- Add SDR hardware abstraction layer (utils/sdr/) with support for:
  - RTL-SDR (existing, using native rtl_* tools)
  - LimeSDR (via SoapySDR)
  - HackRF (via SoapySDR)
- Add hardware type selector to UI with capabilities display
- Add automatic device detection across all supported hardware
- Add hardware-specific parameter validation (frequency/gain ranges)
- Add setup.sh script for automated dependency installation
- Update README with multi-SDR docs, installation guide, troubleshooting
- Add SoapySDR/LimeSDR/HackRF to dependency definitions
- Fix dump1090 detection for Homebrew on Apple Silicon Macs
- Remove defunct NOAA-15/18/19 satellites, add NOAA-21

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

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

utils/sdr/hackrf.py

@@ -0,0 +1,148 @@
+"""
+HackRF command builder implementation.
+
+Uses SoapySDR-based tools for FM demodulation and signal capture.
+HackRF supports 1 MHz to 6 GHz frequency range.
+"""
+
+from typing import Optional
+
+from .base import CommandBuilder, SDRCapabilities, SDRDevice, SDRType
+
+
+class HackRFCommandBuilder(CommandBuilder):
+    """HackRF command builder using SoapySDR tools."""
+
+    CAPABILITIES = SDRCapabilities(
+        sdr_type=SDRType.HACKRF,
+        freq_min_mhz=1.0,        # 1 MHz
+        freq_max_mhz=6000.0,     # 6 GHz
+        gain_min=0.0,
+        gain_max=62.0,           # LNA (0-40) + VGA (0-62)
+        sample_rates=[2000000, 4000000, 8000000, 10000000, 20000000],
+        supports_bias_t=True,
+        supports_ppm=False,
+        tx_capable=True
+    )
+
+    def _build_device_string(self, device: SDRDevice) -> str:
+        """Build SoapySDR device string for HackRF."""
+        if device.serial and device.serial != 'N/A':
+            return f'driver=hackrf,serial={device.serial}'
+        return f'driver=hackrf'
+
+    def _split_gain(self, gain: float) -> tuple[int, int]:
+        """
+        Split total gain into LNA and VGA components.
+
+        HackRF has two gain stages:
+        - LNA: 0-40 dB (RF amplifier)
+        - VGA: 0-62 dB (IF amplifier)
+
+        This function distributes the requested gain across both stages.
+        """
+        if gain <= 40:
+            # All to LNA first
+            return int(gain), 0
+        else:
+            # Max out LNA, rest to VGA
+            lna = 40
+            vga = min(62, int(gain - 40))
+            return lna, vga
+
+    def build_fm_demod_command(
+        self,
+        device: SDRDevice,
+        frequency_mhz: float,
+        sample_rate: int = 22050,
+        gain: Optional[float] = None,
+        ppm: Optional[int] = None,
+        modulation: str = "fm",
+        squelch: Optional[int] = None
+    ) -> list[str]:
+        """
+        Build SoapySDR rx_fm command for FM demodulation.
+
+        For pager decoding and iridium capture with HackRF.
+        """
+        device_str = self._build_device_string(device)
+
+        cmd = [
+            'rx_fm',
+            '-d', device_str,
+            '-f', f'{frequency_mhz}M',
+            '-M', modulation,
+            '-s', str(sample_rate),
+        ]
+
+        if gain is not None and gain > 0:
+            lna, vga = self._split_gain(gain)
+            cmd.extend(['-g', f'LNA={lna},VGA={vga}'])
+
+        if squelch is not None and squelch > 0:
+            cmd.extend(['-l', str(squelch)])
+
+        # Output to stdout
+        cmd.append('-')
+
+        return cmd
+
+    def build_adsb_command(
+        self,
+        device: SDRDevice,
+        gain: Optional[float] = None
+    ) -> list[str]:
+        """
+        Build dump1090/readsb command with SoapySDR support for ADS-B decoding.
+
+        Uses readsb which has better SoapySDR support.
+        """
+        device_str = self._build_device_string(device)
+
+        cmd = [
+            'readsb',
+            '--net',
+            '--device-type', 'soapysdr',
+            '--device', device_str,
+            '--quiet'
+        ]
+
+        if gain is not None:
+            cmd.extend(['--gain', str(int(gain))])
+
+        return cmd
+
+    def build_ism_command(
+        self,
+        device: SDRDevice,
+        frequency_mhz: float = 433.92,
+        gain: Optional[float] = None,
+        ppm: Optional[int] = None
+    ) -> list[str]:
+        """
+        Build rtl_433 command with SoapySDR support for ISM band decoding.
+
+        rtl_433 has native SoapySDR support via -d flag.
+        """
+        device_str = self._build_device_string(device)
+
+        cmd = [
+            'rtl_433',
+            '-d', device_str,
+            '-f', f'{frequency_mhz}M',
+            '-F', 'json'
+        ]
+
+        if gain is not None and gain > 0:
+            cmd.extend(['-g', str(int(gain))])
+
+        return cmd
+
+    def get_capabilities(self) -> SDRCapabilities:
+        """Return HackRF capabilities."""
+        return self.CAPABILITIES
+
+    @classmethod
+    def get_sdr_type(cls) -> SDRType:
+        """Return SDR type."""
+        return SDRType.HACKRF