chore: convert bug report to issue form with required inputs

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,21 +0,0 @@
----
-name: Bug report
-about: Something is broken in the proxy
-title: 'bug: '
-labels: bug
----
-
-**Version:**
-
-**OS:**
-
-**Python version:**
-
-**What happened:**
-
-**Steps to reproduce:**
-
-**DEBUG log excerpt (redact `auth_key` and `script_id`):**
-
-```
-```

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,46 @@
+name: Bug report
+description: Something is broken in the proxy
+title: "bug: "
+labels: ["bug"]
+body:
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      placeholder: "e.g. 1.4.2 or commit abc1234"
+    validations:
+      required: true
+
+  - type: input
+    id: os
+    attributes:
+      label: OS
+      placeholder: "e.g. Windows 11, macOS 14, Ubuntu 22.04"
+    validations:
+      required: true
+
+  - type: input
+    id: python
+    attributes:
+      label: Python version
+      placeholder: "e.g. 3.11.7"
+    validations:
+      required: true
+
+  - type: textarea
+    id: what
+    attributes:
+      label: What happened
+    validations:
+      required: true
+
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: DEBUG log excerpt (redact `auth_key` and `script_id`)
+      render: text