fix(ci): quote "on" key so Gitea parses workflow triggers

Bare on: parses as YAML boolean true (Norway problem); Gitea then ignores the triggers and silently skips jobs. Quoting forces the string key.

.gitea/workflows/cd.yml

@@ -1,6 +1,6 @@
 name: cd
 
-on:
+"on":
   workflow_run:
     workflows: ["CI"]
     types: [completed]

.gitea/workflows/ci.yml

@@ -1,6 +1,6 @@
 name: CI
 
-on:
+"on":
   push:
     branches: [main]
     tags: ["v*"]