fix(mcp): use UUID columns for Passport user references

The User model uses UUID primary keys, but the published Passport migrations
typed user_id (and the client owner morph) as bigint, so issuing a token
truncated the UUID and failed. Switch user_id to foreignUuid and the client
owner to nullableUuidMorphs.

database/migrations/2026_07_17_154027_create_oauth_auth_codes_table.php

@@ -13,7 +13,7 @@ return new class extends Migration
     {
         Schema::create('oauth_auth_codes', function (Blueprint $table) {
             $table->char('id', 80)->primary();
-            $table->foreignId('user_id')->index();
+            $table->foreignUuid('user_id')->index();
             $table->foreignUuid('client_id');
             $table->text('scopes')->nullable();
             $table->boolean('revoked');

database/migrations/2026_07_17_154028_create_oauth_access_tokens_table.php

@@ -13,7 +13,7 @@ return new class extends Migration
     {
         Schema::create('oauth_access_tokens', function (Blueprint $table) {
             $table->char('id', 80)->primary();
-            $table->foreignId('user_id')->nullable()->index();
+            $table->foreignUuid('user_id')->nullable()->index();
             $table->foreignUuid('client_id');
             $table->string('name')->nullable();
             $table->text('scopes')->nullable();

database/migrations/2026_07_17_154030_create_oauth_clients_table.php

@@ -13,7 +13,7 @@ return new class extends Migration
     {
         Schema::create('oauth_clients', function (Blueprint $table) {
             $table->uuid('id')->primary();
-            $table->nullableMorphs('owner');
+            $table->nullableUuidMorphs('owner');
             $table->string('name');
             $table->string('secret')->nullable();
             $table->string('provider')->nullable();

database/migrations/2026_07_17_154031_create_oauth_device_codes_table.php

@@ -13,7 +13,7 @@ return new class extends Migration
     {
         Schema::create('oauth_device_codes', function (Blueprint $table) {
             $table->char('id', 80)->primary();
-            $table->foreignId('user_id')->nullable()->index();
+            $table->foreignUuid('user_id')->nullable()->index();
             $table->foreignUuid('client_id')->index();
             $table->char('user_code', 8)->unique();
             $table->text('scopes');