feat: add support for email verification

backend/resources/migrations/postgres/20260109090200_email_verification.down.sql

@@ -0,0 +1,2 @@
+DROP TABLE email_verification_tokens;
+ALTER TABLE users DROP COLUMN email_verified;

backend/resources/migrations/postgres/20260109090200_email_verification.up.sql

@@ -0,0 +1,21 @@
+CREATE TABLE email_verification_tokens
+(
+    id         TEXT UUID KEY,
+    created_at TIMESTAMPTZ NOT NULL,
+    token      TEXT        NOT NULL UNIQUE,
+    expires_at TIMESTAMPTZ NOT NULL,
+    user_id    TEXT        NOT NULL,
+    CONSTRAINT email_verification_tokens_user_id_fkey
+        FOREIGN KEY (user_id)
+            REFERENCES users (id)
+            ON DELETE CASCADE
+);
+
+ALTER TABLE users
+    ADD COLUMN email_verified BOOLEAN NOT NULL DEFAULT FALSE;
+
+UPDATE users
+SET email_verified = EXISTS (SELECT 1
+                             FROM app_config_variables
+                             WHERE key = 'emailsVerified'
+                               AND value = 'true');