style: apply ruff format across backend + scripts (line-length 100)

Mechanical, whole-tree `ruff format` pass — no behaviour change. Recorded in
.git-blame-ignore-revs (next commit) so git blame skips it.

backend/app/email.py

@@ -4,6 +4,7 @@ Gmail SMTP + App Password by default. Deliberately fail-soft: if SMTP isn't conf
 or a send errors, we log and return False so the caller can fall back to in-app
 notifications — email is never load-bearing for the app's core flow.
 """
+
 import logging
 import smtplib
 import ssl
@@ -77,8 +78,7 @@ def send_access_approved(email: str) -> bool:
         "Open Siftlode and sign in, and your YouTube subscriptions feed will be ready:\n\n"
         f"{settings.app_base}\n\n"
         "If you weren't expecting this, you can ignore the message.\n\n"
-        "— Siftlode"
-        + (f"\n\nQuestions? Just reply to this email ({admin})." if admin else "")
+        "— Siftlode" + (f"\n\nQuestions? Just reply to this email ({admin})." if admin else "")
     )
     return _send([email], "You're in — your Siftlode access is approved", body, reply_to=admin)
 
@@ -90,8 +90,7 @@ def send_access_denied(email: str) -> bool:
         "Thanks for your interest in Siftlode. After review, your access request wasn't approved "
         "this time.\n\n"
         "If you think this was a mistake, you're welcome to reply and let us know.\n\n"
-        "— Siftlode"
-        + (f"\n\nQuestions? Just reply to this email ({admin})." if admin else "")
+        "— Siftlode" + (f"\n\nQuestions? Just reply to this email ({admin})." if admin else "")
     )
     return _send([email], "About your Siftlode access request", body, reply_to=admin)
 
@@ -113,9 +112,7 @@ def send_account_unsuspended(to: str, operator: str | None) -> bool:
     body = (
         "Hi,\n\n"
         "Your Siftlode account has been reinstated — the suspension was lifted and you can sign "
-        "in again."
-        + contact
-        + "\n\n— Siftlode"
+        "in again." + contact + "\n\n— Siftlode"
     )
     return _send([to], "Your Siftlode account has been reinstated", body, reply_to=operator)
 
@@ -130,9 +127,7 @@ def send_account_deleted(to: str, operator: str | None) -> bool:
         "Hi,\n\n"
         "Your Siftlode account and all associated data — subscriptions, tags, watch history, "
         "playlists and settings — have been permanently deleted. Nothing is retained.\n\n"
-        "Thanks for having used Siftlode."
-        + contact
-        + "\n\n— Siftlode"
+        "Thanks for having used Siftlode." + contact + "\n\n— Siftlode"
     )
     return _send([to], "Your Siftlode account has been deleted", body, reply_to=operator)
 
@@ -147,9 +142,7 @@ def send_account_suspended(to: str, operator: str | None) -> bool:
     body = (
         "Hi,\n\n"
         "A sign-in to your Siftlode account was just attempted, but the account is currently "
-        "suspended, so access was denied.\n\n"
-        + contact
-        + "— Siftlode"
+        "suspended, so access was denied.\n\n" + contact + "— Siftlode"
     )
     return _send([to], "Your Siftlode account is suspended", body, reply_to=operator)