Manage projects, members and services through the API

/api/v1/projects, /members and /services: create, list, show, update,
delete and restore, with the panel's own rules — so the MCP server can
load the collective's work, people and offer without anyone retyping
them into forms. The MCP server picks the tools up from openapi.yaml.

- Relations travel as ids and are replaced whole when sent, left alone
  when not: a project's technology_ids, service_ids and members with
  each one's role; a member's technology_ids; a service's
  technology_ids and project_ids. Record and relations are saved in
  one transaction.
- Publishing stays a permission of its own. Without projects.publish
  or services.publish, published_at, unpublish_at and is_published are
  refused — the fields the panel disables for the same people.
- MemberPolicy still lets someone edit their own profile.
- Uploads accept `for: projects` and `for: members`, landing where the
  panel's own upload fields put them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/Http/Requests/Api/V1/Concerns/GuardsPublication.php

@@ -0,0 +1,33 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Requests\Api\V1\Concerns;
+
+use Illuminate\Validation\Validator;
+
+/**
+ * Publishing is a permission of its own, as in the panel — where these fields
+ * are disabled for whoever lacks it. Here they are refused, so someone who may
+ * write a record still cannot put it on the site, or take it off, alone.
+ */
+trait GuardsPublication
+{
+    /**
+     * @param  array<int, string>  $fields
+     */
+    protected function guardPublication(Validator $validator, string $permission, array $fields): void
+    {
+        $validator->after(function (Validator $validator) use ($permission, $fields): void {
+            if ($this->user()?->can($permission)) {
+                return;
+            }
+
+            foreach ($fields as $field) {
+                if ($this->has($field)) {
+                    $validator->errors()->add($field, __('rules.publication.forbidden'));
+                }
+            }
+        });
+    }
+}