Lukas 68c4335348 feat(vpn): add startup connectivity checks and PersistentKeepalive ...

Add check_vpn_connectivity() that runs once after wg0 comes up:
- Waits for handshake (up to 15s) and prints public key if missing
- Measures RX bytes before/after curl to detect server-side routing issues
- Tests DNS resolution and dumps resolv.conf on failure
- On failure prints exact server-side commands to fix (sysctl, iptables, wg)

Add PersistentKeepalive=25 to wg0.conf to keep NAT mappings alive.

2026-05-17 18:40:24 +02:00

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