Phase 1: Foundation - Database schema, core PHP structure, JWT auth, and User CRUD

Implemented:
- Database schema (SQLite) with tables: users, profiles, posts, swipes, matches, chats, chat_messages, events, notifications, relationships, post_likes, post_comments, refresh_tokens, media
- Core PHP structure following skeleton pattern (www/api/)
- JWT Authentication (register, login, refresh, logout)
- User profile CRUD (show, update, delete, search)
- User sub-resources (posts, friends, followers, following)
- Minimal Firebase JWT implementation for PHP without Composer

www/api/src/config/app.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * Application Configuration
+ */
+
+return [
+    'name' => 'Sozial',
+    'env' => $_ENV['APP_ENV'] ?? 'development',
+    'debug' => $_ENV['APP_DEBUG'] ?? true,
+    'url' => 'https://api.sozial.shadow-land.de',
+    'version' => 'v1',
+    'timezone' => 'UTC',
+];

www/api/src/config/database.php

@@ -0,0 +1,14 @@
+<?php
+/**
+ * Database Configuration
+ */
+
+return [
+    'driver' => 'sqlite',
+    'database' => __DIR__ . '/../../database/sozial.db',
+    'options' => [
+        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
+        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
+        PDO::ATTR_EMULATE_PREPARES => false,
+    ],
+];

www/api/src/config/jwt.php

@@ -0,0 +1,11 @@
+<?php
+/**
+ * JWT Configuration
+ */
+
+return [
+    'secret' => $_ENV['JWT_SECRET'] ?? 'sozial-dev-secret-change-in-production',
+    'algorithm' => 'HS256',
+    'access_token_ttl' => 86400, // 24 hours in seconds
+    'refresh_token_ttl' => 2592000, // 30 days in seconds
+];