feat(templates): persist reusable content requirements

src/govoplan_templates/backend/capabilities.py

@@ -146,7 +146,16 @@ class SqlTemplateContentLibrary(TemplateContentLibraryProvider):
                 template_type=request.template_type,
                 usages=list(request.usages),
                 locale=request.locale,
-                required_fields=[],
+                required_fields=[
+                    {
+                        "path": field.path,
+                        "value_type": field.value_type,
+                        "label": field.label,
+                        "required": field.required,
+                        "description": field.description,
+                    }
+                    for field in request.required_fields
+                ],
                 output_profiles=[],
                 content_text=request.content_text,
                 content_html=request.content_html,
@@ -168,6 +177,11 @@ class SqlTemplateContentLibrary(TemplateContentLibraryProvider):
                 "definition_hash": revision.definition_hash,
                 "template_type": revision.template_type,
                 "usages": list(revision.usages or []),
+                "required_fields": [
+                    str(field.get("path") or "")
+                    for field in revision.required_fields or []
+                    if field.get("path")
+                ],
                 "source": "content_library_capability",
             },
             commit=False,

src/govoplan_templates/backend/manifest.py

@@ -104,7 +104,8 @@ DOCUMENTATION = (
         body=(
             "Content fragments retain text and HTML variants, usage constraints, locale, scope, revision, and publication state in Templates. "
             "Campaign can load a fragment or complete email part through the optional content-library capability. Saving from Campaign creates "
-            "a draft and never publishes it automatically. Inserting content changes only the current Campaign draft; existing Campaign versions "
+            "a draft with its declared required-field contract and never publishes it automatically. Consumers show missing required fields before "
+            "applying content. Inserting content changes only the current Campaign draft; existing Campaign versions "
             "and Template revisions remain unchanged."
         ),
         layer="available",
@@ -118,7 +119,8 @@ DOCUMENTATION = (
                 "body": (
                     "Inhaltsbausteine speichern Text- und HTML-Fassungen, Verwendungszwecke, Sprache, Geltungsbereich, Revision und "
                     "Veröffentlichungsstatus in Templates. Campaign kann Bausteine oder vollständige E-Mail-Teile über die optionale "
-                    "Inhaltsbibliothek laden. Das Speichern aus Campaign legt einen Entwurf an und veröffentlicht ihn niemals automatisch. "
+                    "Inhaltsbibliothek laden. Das Speichern aus Campaign legt einen Entwurf mit dem deklarierten Pflichtfeldvertrag an und "
+                    "veröffentlicht ihn niemals automatisch. Fehlende Pflichtfelder werden vor dem Anwenden angezeigt. "
                     "Das Einfügen ändert nur den aktuellen Kampagnenentwurf; bestehende Kampagnenversionen und Template-Revisionen bleiben unverändert."
                 ),
             }

tests/test_templates.py

@@ -13,6 +13,7 @@ from govoplan_core.core.templates import (
     CAPABILITY_TEMPLATE_RENDERER,
     TemplateCompatibilityError,
     TemplateContentDraftRequest,
+    TemplateFieldRequirement,
     TemplateRenderError,
     TemplateRenderRequest,
 )
@@ -182,6 +183,12 @@ class TemplateServiceTests(unittest.TestCase):
                     usages=("campaign.content",),
                     locale="de",
                     content_text="Mit freundlichen Grüßen",
+                    required_fields=(
+                        TemplateFieldRequirement(
+                            path="local.display_name",
+                            label="Display name",
+                        ),
+                    ),
                     metadata={"campaign_targets": ["text"]},
                 ),
             )
@@ -190,6 +197,10 @@ class TemplateServiceTests(unittest.TestCase):
             self.assertEqual("draft", result.status)
             self.assertEqual("content_fragment", result.template_type)
             self.assertEqual("Mit freundlichen Grüßen", result.revision.content_text)
+            self.assertEqual(
+                "local.display_name",
+                result.revision.required_fields[0].path,
+            )
             self.assertEqual(["text"], result.revision.metadata["campaign_targets"])
             self.assertEqual(
                 "templates.content_library",