docs: add GitHub issue templates

- Bug report template with deployment type, browser info, logs
- Feature request template with affected area, priority
- Config with link to discussions and README
- Optimize test.yml to skip tests for non-code changes

.github/workflows/test.yml

@@ -3,6 +3,11 @@ name: Test
 on:
   pull_request:
     branches: [main]
+    paths:
+      - 'backend/**'
+      - 'frontend/**'
+      - 'package*.json'
+      - '.github/workflows/test.yml'
 
 # Minimal permissions for security
 permissions: