feat(ap): ActivityPub spec compliance and profile completeness

Phase 1 — spec compliance:
- Add AS_PUBLIC constant; add to/cc fields to CreateActivity, DeleteActivity,
  UpdateActivity, AddActivity; populate on all broadcast call sites
- Add @context to outbox CreateActivity items
- Set manuallyApprovesFollowers: true to match actual Pending follow flow
- Gate PermissiveVerifier behind FEDERATION_DEBUG env var
- Add updated timestamp to Person actor JSON
- Improve actor update delivery logging

Phase 2a Batch 1 — AP layer:
- Add /inbox shared inbox route; add endpoints.sharedInbox to Person
- Paginate followers and following collections (20/page, OrderedCollectionPage)

Phase 2a Batch 2 — profile completeness:
- DB migrations: banner_path, also_known_as columns; user_profile_fields table
- ProfileField value object; UserProfileFieldsRepository port
- Banner image upload (stored via image-converter, surfaced as image in Person)
- alsoKnownAs field in Person (account migration support)
- Custom profile fields (up to 4 PropertyValue attachments in Person)
- Profile settings UI: banner preview/upload, alsoKnownAs input, fields form
- PUT /api/v1/profile/fields API endpoint

crates/adapters/template-askama/src/lib.rs

@@ -342,6 +342,9 @@ struct ProfileSettingsTemplate<'a> {
     ctx: &'a HtmlPageContext,
     bio: Option<&'a str>,
     avatar_url: Option<&'a str>,
+    banner_url: Option<&'a str>,
+    also_known_as: Option<&'a str>,
+    profile_fields: &'a [(String, String)],
     saved: bool,
 }
 
@@ -703,6 +706,9 @@ impl HtmlRenderer for AskamaHtmlRenderer {
             ctx: &data.ctx,
             bio: data.bio.as_deref(),
             avatar_url: data.avatar_url.as_deref(),
+            banner_url: data.banner_url.as_deref(),
+            also_known_as: data.also_known_as.as_deref(),
+            profile_fields: &data.profile_fields,
             saved: data.saved,
         }
         .render()

crates/adapters/template-askama/templates/profile_settings.html

@@ -6,10 +6,17 @@
 {% endif %}
 <form method="post" action="/settings/profile" enctype="multipart/form-data">
   <input type="hidden" name="_csrf" value="{{ ctx.csrf_token }}">
+
   <label>
     Bio<br>
     <textarea name="bio">{% if let Some(b) = bio %}{{ b }}{% endif %}</textarea>
   </label>
+
+  <label>
+    Also known as (actor URL for account migration)<br>
+    <input type="text" name="also_known_as" value="{% if let Some(v) = also_known_as %}{{ v }}{% endif %}">
+  </label>
+
   {% if let Some(url) = avatar_url %}
   <div>
     <p>Current avatar:</p>
@@ -20,6 +27,30 @@
     Avatar image<br>
     <input type="file" name="avatar" accept="image/jpeg,image/png,image/webp">
   </label>
+
+  {% if let Some(url) = banner_url %}
+  <div>
+    <p>Current banner:</p>
+    <img src="{{ url }}" alt="Current banner" style="max-width:600px;max-height:200px;">
+  </div>
+  {% endif %}
+  <label>
+    Banner image<br>
+    <input type="file" name="banner" accept="image/jpeg,image/png,image/webp">
+  </label>
+
+  <fieldset>
+    <legend>Profile fields (max 4)</legend>
+    {% for i in 0..4usize %}
+    <div>
+      <input type="text" name="field_name_{{ i }}" placeholder="Label"
+             value="{% if let Some((n, _)) = profile_fields.get(*i) %}{{ n }}{% endif %}">
+      <input type="text" name="field_value_{{ i }}" placeholder="Value"
+             value="{% if let Some((_, v)) = profile_fields.get(*i) %}{{ v }}{% endif %}">
+    </div>
+    {% endfor %}
+  </fieldset>
+
   <button type="submit">Save</button>
 </form>
 {% endblock %}