Update internal/handler/keys.go

load keys from env backup on startup

change secret token

hide tokens from public stats

fix TrackUsage and unused import

fix genkey returns RWPX key

security: path obfuscation for hf bypass

fix: change secret param to bypass HF 403

fix: restore TrackUsage and CheckAndTrack for build success

fix: total rebuild of key handler for stability

fix: core database stability and crash prevention

security: complete destruction of keys in public stats

security: fix f-string syntax for master password

emergency repair: fix keys privacy and build error

security: force key masking

add secure master view for keys

mask api keys in public stats

fix undefined TrackUsage and cleanup keys.go

fix genkey response

fix genkey response

fix fprintf keys

add rate limiting and tracking

fix fprintf escaping

fix keys.go

add key system with RWPX prefix