fix(form-compile,form-validate): warn on invalid XDTO types, add Check 12

form-compile now warns when model uses runtime types like
FormDataStructure that don't exist in XML schema. Expanded cfg:
regex to cover all 25 known prefixes.

form-validate adds Check 12 — validates all <v8:Type> values:
ERROR for known-invalid types, WARN for unrecognized bare types,
pass-through for unknown namespaced types (future-proof).

Updated SKILL.md with full type reference and invalid type warning.
Updated docs/1c-form-spec.md with missing type groups.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/skills/cases/form-validate/snapshots/valid-form/Catalogs/Товары/Forms/Форма/Ext/Form.xml

@@ -15,7 +15,7 @@
 	<Attributes>
 		<Attribute name="Объект" id="1">
 			<Type>
-				<v8:Type>FormDataStructure</v8:Type>
+				<v8:Type>cfg:CatalogObject.Товары</v8:Type>
 			</Type>
 			<MainAttribute>true</MainAttribute>
 		</Attribute>

tests/skills/cases/form-validate/valid-form.json

@@ -12,7 +12,7 @@
     },
     {
       "script": "form-compile/scripts/form-compile",
-      "input": { "title": "Тест", "attributes": [{ "name": "Объект", "type": "FormDataStructure", "main": true }], "elements": [{ "type": "InputField", "dataPath": "Объект.Наименование" }] },
+      "input": { "title": "Тест", "attributes": [{ "name": "Объект", "type": "CatalogObject.Товары", "main": true }], "elements": [{ "type": "InputField", "dataPath": "Объект.Наименование" }] },
       "args": { "-JsonPath": "{inputFile}", "-OutputPath": "{workDir}/Catalogs/Товары/Forms/Форма/Ext/Form.xml" }
     }
   ],