feat: sync 12 new skills into catalog (total 31 skills), update manifest and README

skills/drawio-skill/data/SHAPE-INDEX-NOTICE.md

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+# Shape index attribution
+
+`shape-index.json.gz` is a gzipped copy of the shape search index from
+[jgraph/drawio-mcp](https://github.com/jgraph/drawio-mcp) (`shape-search/search-index.json`),
+which is generated from the official draw.io / diagrams.net client shape
+libraries. Both upstream sources are licensed under the **Apache License 2.0**.
+
+- Each entry is `{style, w, h, title, tags, type}` for one palette shape.
+- 10,446 shapes spanning AWS, Azure, GCP, Cisco, Kubernetes, UML, BPMN, P&ID,
+  electrical, flowchart, network, and the general shape sets.
+- Used read-only by `scripts/shapesearch.py` to resolve exact official style
+  strings instead of hand-guessing them.
+
+To refresh against a newer draw.io release, regenerate upstream with
+`shape-search/generate-index.js` in the drawio-mcp repo, then re-gzip:
+
+    gzip -9 -c search-index.json > data/shape-index.json.gz