Fix data loss: remove data files from git, add gitignore, auto-recover

- Remove data/companies.json and data/companies/cuitunet/config.json from git
  (tracked data files get overwritten on every deploy, causing data loss)
- Add data/companies/*/ and data/tickets.json to .gitignore
- Migration now auto-recovers companies.json and config.json if missing
  (handles case where git clean removes untracked data files)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api.php

@@ -138,6 +138,26 @@ function saveCompanyConfig(array $config): void {
 function runMigration(): void {
     $companiesDir = DATA_DIR . '/companies';
 
+    // Varmista companies.json olemassaolo (voi kadota git deploy:ssa)
+    if (!file_exists(COMPANIES_FILE)) {
+        // Jos cuitunet-hakemisto on olemassa, se on jo migrattu aiemmin → luo pelkkä companies.json
+        if (is_dir($companiesDir . '/cuitunet')) {
+            $companies = [[
+                'id' => 'cuitunet',
+                'nimi' => 'CuituNet',
+                'luotu' => date('Y-m-d H:i:s'),
+                'aktiivinen' => true,
+            ]];
+            file_put_contents(COMPANIES_FILE, json_encode($companies, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));
+        }
+    }
+
+    // Varmista yrityksen config.json (voi kadota git deploy:ssa)
+    $cuitunetConfig = $companiesDir . '/cuitunet/config.json';
+    if (is_dir($companiesDir . '/cuitunet') && !file_exists($cuitunetConfig)) {
+        file_put_contents($cuitunetConfig, json_encode(['mailboxes' => [], 'ticket_rules' => []], JSON_PRETTY_PRINT));
+    }
+
     // Tarkista onko vanha data olemassa juuressa (pre-multitenant)
     $oldCustomers = DATA_DIR . '/customers.json';
     if (!file_exists($oldCustomers)) return; // Ei vanhaa dataa → ei migraatiota