Bump to 1.1.5

[MagicalTux]

Patch version bump 1.1.4 → 1.1.5.

Rolls up this batch of merged work:

• fix: recover from network drops without restarting #78 network-drop recovery timeouts
• Fix: revalidate throttled accounts so a stale 429 hold cannot require a restart #77 throttled-account revalidation
• feat: add third-party backend account support (upstream, modelMap, models) #74/test: cover third-party backend routing and model rewrite (#74) #79 third-party backend accounts (+ tests)
• feat: opt-in keep-warm for idle accounts + per-account pin endpoint (#76) #80 opt-in keep-warm + per-account pin endpoint
• fix: harden proxy security, account selection, and scheduler lifecycle #81 security/selection/lifecycle hardening (localhost-default bind, CONNECT auth gate, etc.)

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