chore: contributor workflow — templates, git-cliff, gitea-workflow doc (closes #31) (#38)

.gitea/ISSUE_TEMPLATE/bug.md

@@ -0,0 +1,21 @@
+---
+name: Bug
+about: Something behaves incorrectly
+title: ""
+labels:
+  - type:bug
+---
+
+**What happened:**
+
+**What you expected:**
+
+**Steps to reproduce:**
+1.
+2.
+
+**Environment:** <!-- branch/commit, OS, container engine, anything relevant -->
+
+**Logs / evidence:**
+
+**Suspected area:** <!-- e.g. area:bff, area:acl — add the matching area label -->