feat(workflows): migrate legacy workflows and enhance example handling

- Migrated legacy workflow files from `packages/server/workflows/` to `packages/server/data/workflows/` when the new store is empty.
- Introduced new API endpoints to list and retrieve example workflows.
- Added a dialog component for selecting example workflows when creating new workflows.
- Updated workflow paths and configurations to reflect the new structure.
- Enhanced the README and AGENTS.md documentation to clarify workflow management and usage.

Co-authored-by: Nasyarobby Putra <nasyarobby@gmail.com>

examples/workflows/detect-example-changes.yaml

@@ -0,0 +1,22 @@
+name: detect example.com changes
+description: |
+  Fetch example.com, fingerprint the response, and report whether it changed
+  since the previous run. Uses detect-url-changes with a transform that builds
+  a human-readable message into ctx.data.message.
+scripts:
+  - script: detect-url-changes.js
+    config:
+      url: https://example.com/
+      outputVar: message
+      transform: |
+        data.hasChanges
+          ? "example.com changed (fingerprint " & data.fingerprint & ")"
+          : "example.com unchanged since " & data.fingerprintAt
+triggers:
+  - type: HTTP
+    method: POST
+    path: /detect-example
+  - type: cron
+    schedule: "* * * * *"
+    onConsecutiveFailures: 3
+enabled: false