feat: add read-only Social Accounts API

Add GET /api/accounts (list with optional ?network= and ?type= filters) and
GET /api/accounts/{socialAccount} (show) endpoints. Include plain-text password
field for AI agent consumption.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/Feature/Api/SocialAccountsApiTest.php

@@ -0,0 +1,46 @@
+<?php
+
+use App\Models\SocialAccount;
+
+test('it lists all social accounts including password', function () {
+    SocialAccount::factory()->count(3)->create();
+
+    $response = $this->getJson('/api/accounts');
+
+    $response->assertOk()->assertJsonCount(3, 'data');
+    expect($response->json('data.0'))->toHaveKey('password');
+});
+
+test('it filters accounts by network', function () {
+    SocialAccount::factory()->create(['network' => 'twitter']);
+    SocialAccount::factory()->create(['network' => 'instagram']);
+
+    $response = $this->getJson('/api/accounts?network=twitter');
+
+    $response->assertOk()
+        ->assertJsonCount(1, 'data')
+        ->assertJsonPath('data.0.network', 'twitter');
+});
+
+test('it filters accounts by type', function () {
+    SocialAccount::factory()->create(['type' => 'post']);
+    SocialAccount::factory()->create(['type' => 'like']);
+
+    $response = $this->getJson('/api/accounts?type=post');
+
+    $response->assertOk()
+        ->assertJsonCount(1, 'data')
+        ->assertJsonPath('data.0.type', 'post');
+});
+
+test('it shows a single account with password', function () {
+    $account = SocialAccount::factory()->create(['password' => 'super-secret']);
+
+    $response = $this->getJson("/api/accounts/{$account->id}");
+
+    $response->assertOk()->assertJsonPath('data.password', 'super-secret');
+});
+
+test('it returns 404 for a missing account', function () {
+    $this->getJson('/api/accounts/999')->assertNotFound();
+});