Bump to v1.4.0: tap-to-dismiss, docker restart detection, cleanup thread fix

Add /clear-all endpoint and wire it to the tap handler so tapping the
display dismisses active warnings/critical alerts. Fix docker detector
to track restart count deltas instead of relying on the transient
"restarting" state. Wrap cleanup thread in try/except so it can't die
silently and leave events stuck forever.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -188,6 +188,7 @@ automation:
 | `/events` | GET    | List all active events                           |
 | `/event`  | POST   | Register an event                                |
 | `/clear`  | POST   | Clear an event by ID                             |
+| `/clear-all` | POST | Clear all active events                         |
 | `/notify` | POST   | Simple notification `{"message": "", "duration": 5}` |
 | `/sleep`  | POST   | Enter sleep mode                                 |
 | `/wake`   | POST   | Exit sleep mode                                  |
@@ -203,7 +204,7 @@ The emote has personality! In optimal state it:
 - Occasionally winks `( -_^)` or blinks `( ᵕ.ᵕ)` for a second or two
 - Celebrates `\(^o^)/` when recovering from warnings
 - Each face has its own animation (floating, bouncing, swaying)
-- Reacts when tapped `( °o°)` and shows version info
+- Reacts when tapped `( °o°)`, shows version info, and dismisses active alerts
 
 **Sound effects** (tap screen to enable, or use `?sound=on`):
 - Warning: soft double-beep