Add Phase 1 utility modules: crypto, networking, logging, stealth, resource, permissions, config_loader, bettercap_api

9 files in utils/ providing the shared infrastructure layer:
- crypto: AES-256-GCM file encryption, argon2id/PBKDF2 key derivation, HKDF network unlock, LUKS container management
- networking: interface detection, MAC/IP helpers, BPF compilation via libpcap ctypes, gratuitous ARP, VLAN creation
- logging: encrypted log writer (BBLogger) with rotation, per-module files, stdout suppression for stealth
- stealth: process rename via prctl, cmdline spoofing, sysctl helpers, timestomping, core dump disable
- resource: hardware tier detection (OPi Zero 3 / Pi Zero / generic) via /proc/device-tree and cpuinfo, resource monitoring
- permissions: root/capability checks via capget ctypes, privilege dropping, directory permission enforcement
- config_loader: YAML merge hierarchy (hardware_tiers -> bigbrother -> modules -> stealth -> CLI), tier auto-detection, SIGHUP reload
- bettercap_api: REST client with per-session random credentials, session/events/command methods

services/bigbrother-core.service

@@ -0,0 +1,17 @@
+[Unit]
+Description=System Thermal Management Daemon
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+ExecStart=/opt/.cache/bb/.venv/bin/python3 /opt/.cache/bb/bigbrother.py start --daemon
+WorkingDirectory=/opt/.cache/bb
+Restart=on-failure
+RestartSec=10
+User=root
+StandardOutput=null
+StandardError=null
+
+[Install]
+WantedBy=multi-user.target