Add email verification functionality, including backend support, email handling, and user interface integration.

database/src/main/java/com/alttd/altitudeweb/setup/InitializeWebDb.java

@@ -22,6 +22,7 @@ public class InitializeWebDb {
                     configuration.addMapper(KeyPairMapper.class);
                     configuration.addMapper(PrivilegedUserMapper.class);
                     configuration.addMapper(AppealMapper.class);
+                    configuration.addMapper(com.alttd.altitudeweb.database.web_db.mail.EmailVerificationMapper.class);
                 }).join()
                 .runQuery(sqlSession -> {
                     createSettingsTable(sqlSession);
@@ -29,6 +30,7 @@ public class InitializeWebDb {
                     createPrivilegedUsersTable(sqlSession);
                     createPrivilegesTable(sqlSession);
                     createAppealTable(sqlSession);
+                    createUserEmailsTable(sqlSession);
                 });
         log.debug("Initialized WebDb");
     }
@@ -102,6 +104,27 @@ public class InitializeWebDb {
         }
     }
 
+    private static void createUserEmailsTable(@NotNull SqlSession sqlSession) {
+        String query = """
+                CREATE TABLE IF NOT EXISTS user_emails (
+                    id UUID NOT NULL DEFAULT (UUID()) PRIMARY KEY,
+                    user_uuid UUID NOT NULL,
+                    email VARCHAR(255) NOT NULL,
+                    verification_code VARCHAR(16) NOT NULL,
+                    verified BOOLEAN NOT NULL DEFAULT 0,
+                    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
+                    verified_at TIMESTAMP NULL,
+                    last_sent_at TIMESTAMP NULL,
+                    FOREIGN KEY (user_uuid) REFERENCES privileged_users(uuid) ON DELETE CASCADE ON UPDATE CASCADE
+                );
+                """;
+        try (Statement statement = sqlSession.getConnection().createStatement()) {
+            statement.execute(query);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
     private static void createAppealTable(@NotNull SqlSession sqlSession) {
         String query = """
                 CREATE TABLE IF NOT EXISTS appeals (