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>

.claude-plugin/marketplace.json

@@ -6,7 +6,7 @@
   },
   "metadata": {
     "description": "Project management plugins with Gitea and NetBox integrations",
-    "version": "5.6.0"
+    "version": "5.7.0"
   },
   "plugins": [
     {
@@ -155,7 +155,7 @@
     },
     {
       "name": "data-platform",
-      "version": "1.2.0",
+      "version": "1.3.0",
       "description": "Data engineering tools with pandas, PostgreSQL/PostGIS, and dbt integration",
       "source": "./plugins/data-platform",
       "author": {