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>

openapi.yaml

@@ -14,7 +14,7 @@ info:
     ## TTL/Heartbeat Pattern
     Events can have a TTL (time-to-live) that auto-expires them. Detectors typically send
     heartbeat events that expire if not refreshed, indicating loss of communication.
-  version: 1.3.0
+  version: 1.4.0
   license:
     name: MIT
 
@@ -65,6 +65,21 @@ paths:
               schema:
                 $ref: "#/components/schemas/Error"
 
+  /clear-all:
+    post:
+      summary: Clear all events
+      description: |
+        Clear all active events at once. Used by the frontend when the display
+        is tapped to dismiss warnings and critical alerts.
+      operationId: clearAllEvents
+      responses:
+        "200":
+          description: All events cleared
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ClearAllResponse"
+
   /clear:
     post:
       summary: Clear an event
@@ -233,6 +248,19 @@ components:
         current_state:
           $ref: "#/components/schemas/Status"
 
+    ClearAllResponse:
+      type: object
+      properties:
+        status:
+          type: string
+          example: "cleared"
+        count:
+          type: integer
+          description: Number of events that were cleared
+          example: 2
+        current_state:
+          $ref: "#/components/schemas/Status"
+
     ClearResponse:
       type: object
       properties: