docs: bump version to 5.7.0 and update documentation

- marketplace.json: 5.6.0 → 5.7.0
- data-platform plugin.json: 1.1.0 → 1.3.0
- CHANGELOG.md: Add v5.7.0 entry with data-platform additions
- README.md: Update Domain Advisory table (Data: planned → active)

Domain Advisory Pattern now fully operational for both domains.

Closes #377

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/data-platform/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "data-platform",
-  "version": "1.1.0",
+  "version": "1.3.0",
   "description": "Data engineering tools with pandas, PostgreSQL/PostGIS, and dbt integration",
   "author": {
     "name": "Leo Miranda",