Implement Issue #1: User Accounts & Profiles

- Admin-only account creation (no self-registration); invite-token flow
  replaces the public /auth/register endpoint
- New volunteer fields: phone, is_trainee, operational_roles,
  notification_preference, admin_notes, last_login, completed_shifts
- Role-scoped profile editing: volunteers update name/phone only;
  admins update all fields including notes and trainee flag
- /auth/activate endpoint for invite-token-based account activation
- /api/v1/volunteers/{id}/invite for admin to resend invite links
- last_login recorded on each successful authentication

Tests:
- Go: handler tests (auth rules, create, activate, update scoping) via
  Storer/AuthServicer interfaces and fake store; auth unit tests for
  HashPassword, IssueToken, and Parse
- Frontend: RTL tests for Activate, Profile, and Volunteers pages
- Fixed CRA 5 + React Router v7 Jest compatibility (moduleNameMapper +
  TextEncoder polyfill)
- Replaced stale CRA App.test.tsx placeholder with real tests

CI:
- .gitea/workflows/ci.yml runs go vet, go test, tsc, and npm test on
  every push and pull request

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

internal/db/schema.go

@@ -2,15 +2,32 @@ package db
 
 var statements = []string{
 	`CREATE TABLE IF NOT EXISTS volunteers (
-    id          INT AUTO_INCREMENT PRIMARY KEY,
-    name        VARCHAR(255) NOT NULL,
-    email       VARCHAR(255) NOT NULL UNIQUE,
-    password    VARCHAR(255) NOT NULL,
-    role        VARCHAR(50) NOT NULL DEFAULT 'volunteer' COMMENT 'admin or volunteer',
-    active      TINYINT NOT NULL DEFAULT 1,
-    created_at  TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
-    updated_at  TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
+    id                      INT AUTO_INCREMENT PRIMARY KEY,
+    name                    VARCHAR(255) NOT NULL,
+    email                   VARCHAR(255) NOT NULL UNIQUE,
+    password                VARCHAR(255) NOT NULL DEFAULT '',
+    role                    VARCHAR(50) NOT NULL DEFAULT 'volunteer' COMMENT 'admin or volunteer',
+    active                  TINYINT NOT NULL DEFAULT 1,
+    is_trainee              TINYINT NOT NULL DEFAULT 0,
+    phone                   VARCHAR(20) NULL,
+    operational_roles       TEXT NOT NULL DEFAULT '',
+    notification_preference VARCHAR(50) NOT NULL DEFAULT 'email',
+    admin_notes             TEXT NULL,
+    last_login              DATETIME NULL,
+    invite_token            VARCHAR(255) NULL,
+    invite_expires_at       DATETIME NULL,
+    created_at              TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    updated_at              TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci`,
+	// Additive column migrations for existing deployments
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS is_trainee TINYINT NOT NULL DEFAULT 0`,
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS phone VARCHAR(20) NULL`,
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS operational_roles TEXT NOT NULL DEFAULT ''`,
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS notification_preference VARCHAR(50) NOT NULL DEFAULT 'email'`,
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS admin_notes TEXT NULL`,
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS last_login DATETIME NULL`,
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS invite_token VARCHAR(255) NULL`,
+	`ALTER TABLE volunteers ADD COLUMN IF NOT EXISTS invite_expires_at DATETIME NULL`,
 	`CREATE TABLE IF NOT EXISTS schedules (
     id            INT AUTO_INCREMENT PRIMARY KEY,
     volunteer_id  INT NOT NULL,