Fix Navidrome automatic library scan schedule (#101)

## Summary
- Fix env var name from `ND_SCANSCHEDULE` to `ND_SCANNER_SCHEDULE` (Navidrome uses viper config where dots become underscores)
- Use explicit `@every 1h` format for clarity
- Reorder CLAUDE.md rules to emphasize running zk-docs first

## Root Cause
Navidrome logs showed "Periodic scan is DISABLED" at startup despite the env var being set. The config key is `scanner.schedule`, which translates to `ND_SCANNER_SCHEDULE` (not `ND_SCANSCHEDULE`).

## Deployment and Testing
- [ ] Sync navidrome app: `argocd app sync navidrome`
- [ ] Verify pod restarts with new env var
- [ ] Check logs for "Scheduling scanner" message instead of "Periodic scan is DISABLED"
- [ ] Wait ~1 hour and confirm scan runs automatically

🤖 Generated with [Claude Code](https://claude.ai/code)

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/101

argocd/manifests/navidrome/deployment.yaml

@@ -21,8 +21,8 @@ spec:
             - containerPort: 4533
               name: http
           env:
-            - name: ND_SCANSCHEDULE
-              value: "1h"
+            - name: ND_SCANNER_SCHEDULE
+              value: "@every 1h"
             - name: ND_LOGLEVEL
               value: "info"
             - name: ND_MUSICFOLDER