feat(indexing): Lot 4 - Progression temps reel, Full Rebuild, Optimisations

- Ajout migrations DB: index_job_errors, library_monitoring, full_rebuild_type
- API: endpoints progression temps reel (/jobs/:id/stream), active jobs, details
- API: support full_rebuild avec suppression donnees existantes
- Indexer: logs detailles avec timing [SCAN][META][PARSER][BDD]
- Indexer: optimisation parsing PDF (lopdf -> pdfinfo) 235x plus rapide
- Indexer: corrections chemins LIBRARIES_ROOT_PATH pour dev local
- Backoffice: composants JobProgress, JobsIndicator (header), JobsList
- Backoffice: SSE streaming pour progression temps reel
- Backoffice: boutons Index/Index Full sur page libraries
- Backoffice: highlight job apres creation avec redirection
- Fix: parsing volume type i32, sync meilisearch cleanup

Perf: parsing PDF passe de 8.7s a 37ms
Perf: indexation 45 fichiers en ~15s vs plusieurs minutes avant

infra/migrations/0004_library_monitoring.sql

@@ -0,0 +1,17 @@
+-- Migration: Surveillance automatique des libraries (T23)
+-- Ajout des colonnes pour la configuration du scan automatique
+
+ALTER TABLE libraries 
+  ADD COLUMN IF NOT EXISTS monitor_enabled BOOLEAN NOT NULL DEFAULT FALSE,
+  ADD COLUMN IF NOT EXISTS scan_mode TEXT NOT NULL DEFAULT 'manual' CHECK (scan_mode IN ('manual', 'hourly', 'daily', 'weekly')),
+  ADD COLUMN IF NOT EXISTS last_scan_at TIMESTAMPTZ,
+  ADD COLUMN IF NOT EXISTS next_scan_at TIMESTAMPTZ;
+
+-- Index pour trouver rapidement les libraries à scanner
+CREATE INDEX IF NOT EXISTS idx_libraries_monitor_enabled ON libraries(monitor_enabled);
+CREATE INDEX IF NOT EXISTS idx_libraries_next_scan_at ON libraries(next_scan_at) WHERE monitor_enabled = TRUE;
+
+COMMENT ON COLUMN libraries.monitor_enabled IS 'Active la surveillance automatique de la library';
+COMMENT ON COLUMN libraries.scan_mode IS 'Mode de scan: manual, hourly (60min), daily (1440min), weekly (10080min)';
+COMMENT ON COLUMN libraries.last_scan_at IS 'Date du dernier scan (manuel ou automatique)';
+COMMENT ON COLUMN libraries.next_scan_at IS 'Date du prochain scan automatique prévu';