feat(auth): B-2.3 emails FR + DictIA branding (SMTP Resend)

Rebrand src/services/email.py IN PLACE: French + DictIA + brand gradient
(#0062ff/#00bdd8/#00c896) — replaces legacy "Speakr" / #2563eb. Greetings now
use user.name with fallback to user.username. Subjects:
"Vérifiez votre courriel — DictIA" + "Réinitialiser votre mot de passe — DictIA".
SMTP_FROM_NAME defaults to DictIA. Footer points to info@dictia.ca with the
Loi 25 tagline.

Refonte 4 auth templates IN PLACE pour étendre marketing/base.html : check_email,
forgot_password, reset_password, verify_success. Tokens DictIA (brand-navy,
brand-bg, grad-bg, shadow-cta), French copy, WCAG patterns (label for,
focus-visible:outline-2, role=alert, aria-required, text-brand-navy/70 minimum,
NBSP français pour Loi 25 / 24 heures / 1 heure / 8 caractères).

Translate inline French flash messages in src/api/auth.py for /verify-email,
/resend-verification, /forgot-password, /reset-password. Anti-enumeration fix:
forgot_password no longer flashes the cooldown remaining (would leak account
existence) — silently skips resend, generic flash unchanged. Cooldown logic
in src/services/email.py UNCHANGED (60s — verified by test).

config/env.email.example: defaults to Resend SMTP at the top + adds Resend
to the provider examples list (preserves Gmail/SendGrid/Mailgun/SES/M365).

Tests: tests/test_email_service_dictia.py — 12 tests covering DictIA branding,
French copy, display-name fallback, anti-enumeration parity (forgot_password
returns identical message for known/unknown emails), 60s cooldown, SMTP-not-
configured returns False (no exception), check_email.html extends marketing/base
(no var(--text-primary) leaks). Includes Windows manual driver
(_run_email_service_dictia_windows.py) since pytest cannot collect on Windows
native (fcntl POSIX-only).

NO new dependency added (no resend SDK — SMTP via existing _send_email).
NO new route added or removed.
NO src/auth_extended/ created.
NO change to itsdangerous-based token logic.
templates/auth/**/*.html already in tailwind.config.js content array (B-2.2).

Verified locally on Windows manual driver: 12/12 PASS B-2.3, 9/9 PASS regression
on B-2.2 signup, 9/9 PASS regression on B-2.1 ConsentLog.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/_run_email_service_dictia_windows.py

@@ -0,0 +1,78 @@
+"""Windows manual driver for tests/test_email_service_dictia.py.
+
+src/init_db.py imports `fcntl`, which is POSIX-only. On Windows we stub it
+before src.app gets imported, then run each test_* function and report.
+
+Run from the repo root:
+    py -3 tests/_run_email_service_dictia_windows.py
+
+This script is local-dev only (not picked up by pytest collection).
+"""
+import os
+import sys
+import types
+import traceback
+
+# 1) Stub fcntl BEFORE any import of src.* happens.
+if 'fcntl' not in sys.modules:
+    fcntl_stub = types.ModuleType('fcntl')
+    fcntl_stub.LOCK_EX = 2
+    fcntl_stub.LOCK_NB = 4
+    fcntl_stub.LOCK_UN = 8
+    fcntl_stub.LOCK_SH = 1
+    fcntl_stub.flock = lambda *_args, **_kw: None
+    fcntl_stub.fcntl = lambda *_args, **_kw: 0
+    sys.modules['fcntl'] = fcntl_stub
+
+# 2) Make repo root importable
+HERE = os.path.dirname(os.path.abspath(__file__))
+REPO = os.path.dirname(HERE)
+sys.path.insert(0, REPO)
+
+# 3) Set test config
+os.environ.setdefault('SQLALCHEMY_DATABASE_URI', 'sqlite:///:memory:')
+os.environ.setdefault('SECRET_KEY', 'test-secret-key')
+os.environ.setdefault('ENABLE_EMAIL_VERIFICATION', 'false')
+# Avoid sys.exit(1) in src/config/app_config.py legacy validation.
+os.environ.setdefault('TRANSCRIPTION_BASE_URL', 'http://test-stub')
+os.environ.setdefault('TRANSCRIPTION_API_KEY', 'test-stub')
+# Disable rate limits for forgot_password endpoint test.
+os.environ.setdefault('RATELIMIT_ENABLED', 'false')
+# Force UTF-8 stdout so src.app's emoji prints don't crash on cp1252 Windows.
+try:
+    sys.stdout.reconfigure(encoding='utf-8', errors='replace')
+    sys.stderr.reconfigure(encoding='utf-8', errors='replace')
+except Exception:
+    pass
+
+# 4) Import the test module and run every test_* function it defines
+import importlib.util  # noqa: E402
+spec = importlib.util.spec_from_file_location(
+    'test_email_service_dictia',
+    os.path.join(HERE, 'test_email_service_dictia.py'),
+)
+mod = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(mod)
+
+tests = [(name, fn) for name, fn in vars(mod).items()
+         if name.startswith('test_') and callable(fn)]
+
+passed = 0
+failed = []
+for name, fn in tests:
+    try:
+        fn()
+        print(f'  PASS  {name}')
+        passed += 1
+    except Exception as e:  # noqa: BLE001
+        print(f'  FAIL  {name}: {type(e).__name__}: {e}')
+        failed.append((name, traceback.format_exc()))
+
+total = len(tests)
+print()
+print(f'Result: {passed}/{total} passed, {len(failed)} failed')
+if failed:
+    print('\n--- Failures ---\n')
+    for name, tb in failed:
+        print(f'### {name}\n{tb}\n')
+sys.exit(0 if not failed else 1)