feat(persons): add notes field to person profile (issue #23)

V5 Flyway migration adds TEXT notes column; Person entity, service, and
controller updated to persist notes. Frontend edit form adds textarea and
view mode renders the notes section. Backed by 2 new service unit tests
(persist + blank clears).

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

frontend/src/lib/generated/api.ts

@@ -307,6 +307,7 @@ export interface components {
             firstName: string;
             lastName: string;
             alias?: string;
+            notes?: string;
         };
         DocumentUpdateDTO: {
             title?: string;

frontend/src/routes/persons/[id]/+page.server.ts

@@ -28,6 +28,7 @@ export const actions = {
         const firstName = formData.get('firstName')?.toString().trim();
         const lastName = formData.get('lastName')?.toString().trim();
         const alias = formData.get('alias')?.toString().trim() || undefined;
+        const notes = formData.get('notes')?.toString().trim() || undefined;
 
         if (!firstName || !lastName) {
             return fail(400, { updateError: 'Vor- und Nachname sind Pflichtfelder.' });
@@ -36,7 +37,7 @@ export const actions = {
         const api = createApiClient(fetch);
         const { error: apiError } = await api.PUT('/api/persons/{id}', {
             params: { path: { id: params.id } },
-            body: { firstName, lastName, ...(alias ? { alias } : {}) }
+            body: { firstName, lastName, ...(alias ? { alias } : {}), ...(notes ? { notes } : {}) }
         });
 
         if (apiError) {

frontend/src/routes/persons/[id]/+page.svelte

@@ -86,6 +86,16 @@
                                     class="block w-full border border-gray-300 rounded px-3 py-2 font-serif text-brand-navy focus:outline-none focus:border-brand-navy"
                                 />
                             </div>
+                            <div class="md:col-span-2">
+                                <label for="notes" class="block text-xs font-bold uppercase tracking-widest text-gray-400 mb-1">{m.person_label_notes()}</label>
+                                <textarea
+                                    id="notes"
+                                    name="notes"
+                                    rows="4"
+                                    placeholder={m.person_placeholder_notes()}
+                                    class="block w-full border border-gray-300 rounded px-3 py-2 font-serif text-brand-navy focus:outline-none focus:border-brand-navy resize-y"
+                                >{person.notes ?? ''}</textarea>
+                            </div>
                         </div>
 
                         <div class="flex gap-3">
@@ -136,6 +146,13 @@
                                 <span class="block text-lg font-serif text-brand-navy italic">"{person.alias}"</span>
                             </div>
                             {/if}
+
+                            {#if person.notes}
+                            <div class="md:col-span-2">
+                                <span class="block text-xs font-bold font-sans text-gray-400 uppercase tracking-widest mb-1">{m.person_label_notes()}</span>
+                                <p class="text-base font-serif text-brand-navy whitespace-pre-wrap">{person.notes}</p>
+                            </div>
+                            {/if}
                         </div>
                     </div>
                 </div>