fix: add missing remote DB migrations and deploy-migrate recipe

Four ALTER TABLE / CREATE TABLE statements were applied locally but never
deployed to the remote production database, causing:

- acces.php → 500: share_links.is_archived missing (ShareLink::listActive/listArchived)
- parametres.php → 500: smtp_settings.notify_email missing (SmtpRelay::getSettings)
- /tfe?id=N → redirect-to-home: thesis_files.sort_order missing (getThesisFiles ORDER BY)
- admin_audit_log table missing (AdminLogger::insertDb, best-effort but noisy)

Adds four pending migrations (008–011) covering all missing schema changes.
Adds 'deploy-migrate' just recipe to run migrations on the remote after deploy.

app/migrations/pending/008_share_links_is_archived.sql

@@ -0,0 +1,5 @@
+-- Migration 008: add is_archived to share_links
+-- Required by ShareLink::listActive() / listArchived() / archive() / validateLink().
+ALTER TABLE share_links ADD COLUMN is_archived INTEGER NOT NULL DEFAULT 0;
+
+CREATE INDEX IF NOT EXISTS idx_share_links_archived ON share_links(is_archived);