fix(review): address second-pass PR #787 review blockers

- CLAUDE.md: add Geschichte and JourneyItem rows to the Domain Model table
- GeschichteSummary: add @Schema(requiredMode=REQUIRED) to getId, getTitle,
  getStatus, getType, and AuthorSummary.getEmail so the TypeScript generator
  emits non-optional fields when api.ts is next regenerated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/main/java/org/raddatz/familienarchiv/geschichte/GeschichteSummary.java

@@ -1,5 +1,6 @@
 package org.raddatz.familienarchiv.geschichte;
 
+import io.swagger.v3.oas.annotations.media.Schema;
 import java.time.LocalDateTime;
 import java.util.UUID;
 
@@ -13,12 +14,16 @@ import java.util.UUID;
  */
 public interface GeschichteSummary {
 
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
     UUID getId();
 
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
     String getTitle();
 
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
     GeschichteStatus getStatus();
 
+    @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
     GeschichteType getType();
 
     /** Nested closed projection — exposes only the fields the grid card needs. */
@@ -31,6 +36,7 @@ public interface GeschichteSummary {
     interface AuthorSummary {
         String getFirstName();
         String getLastName();
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
         String getEmail();
     }
 }