renamed async fastapi skill

docs/skills/async-fastapi-sqlmodel/references/template.md

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+# <Concept Title>
+
+!!! info "Primary sources"
+    - Primary source: `<primary source URL>`
+    - Secondary source: `<secondary source URL>`
+
+??? abstract "Decision metadata"
+    - Status: draft|adopted|deprecated
+    - Decision level: advisory|mandatory
+    - Applies to: api-runtime|workers|tests
+    - Last reviewed: YYYY-MM-DD
+
+---
+
+## Purpose
+
+Describe what this concept governs and why it exists.
+
+## Scope and Non-Goals
+
+- In scope:
+- Out of scope:
+
+---
+
+## Rules
+
+- Rule 1
+- Rule 2
+
+---
+
+## Recommended Pattern
+
+```python
+# minimal example
+```
+
+---
+
+## Anti-Patterns
+
+- Anti-pattern 1
+- Anti-pattern 2
+
+---
+
+## Operational Checks
+
+- Check 1
+- Check 2
+
+---
+
+## Testing Checks
+
+- Test 1
+- Test 2
+
+---
+
+## Migration Notes
+
+- Staged rollout notes and compatibility caveats.