Fix SQLite init: lazy loading, writability check, and host permissions

DB initialization was eager at module import time, crashing the entire
analytics route when /server_storage wasn't writable. Now deferred to
first logVisit() call with graceful fallback. Also fix deploy workflow
to chown via a bind-mounted container so permissions apply on the host.

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

lib/db.ts

@@ -1,28 +1,52 @@
 import Database from 'better-sqlite3';
+import type BetterSqlite3 from 'better-sqlite3';
 import path from 'path';
 import fs from 'fs';
 
-const SERVER_STORAGE = '/server_storage';
-const dbPath = fs.existsSync(SERVER_STORAGE)
-  ? path.join(SERVER_STORAGE, 'visitors.db')
-  : path.join(process.cwd(), 'visitors.db');
+let db: BetterSqlite3.Database | null = null;
+let insertStmt: BetterSqlite3.Statement | null = null;
 
-const db = new Database(dbPath);
-db.pragma('journal_mode = WAL');
+function getDb() {
+  if (db) return db;
 
-db.exec(`
-  CREATE TABLE IF NOT EXISTS visits (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    ip_address TEXT NOT NULL,
-    path TEXT NOT NULL,
-    visited_at TEXT NOT NULL DEFAULT (datetime('now'))
-  );
-`);
+  try {
+    const SERVER_STORAGE = '/server_storage';
+    let dbDir: string;
+    try {
+      fs.accessSync(SERVER_STORAGE, fs.constants.W_OK);
+      dbDir = SERVER_STORAGE;
+    } catch {
+      dbDir = process.cwd();
+    }
 
-const insertStmt = db.prepare(
-  'INSERT INTO visits (ip_address, path) VALUES (?, ?)'
-);
+    const dbPath = path.join(dbDir, 'visitors.db');
+    db = new Database(dbPath);
+    db.pragma('journal_mode = WAL');
+
+    db.exec(`
+      CREATE TABLE IF NOT EXISTS visits (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        ip_address TEXT NOT NULL,
+        path TEXT NOT NULL,
+        visited_at TEXT NOT NULL DEFAULT (datetime('now'))
+      );
+    `);
+
+    insertStmt = db.prepare(
+      'INSERT INTO visits (ip_address, path) VALUES (?, ?)'
+    );
+
+    return db;
+  } catch (e) {
+    console.error('Failed to initialize SQLite database:', e);
+    db = null;
+    insertStmt = null;
+    return null;
+  }
+}
 
 export function logVisit(ip: string, visitPath: string) {
+  const database = getDb();
+  if (!database || !insertStmt) return;
   insertStmt.run(ip, visitPath);
 }