Remove legacy pc tables, fix ASP issues, update dashboard APIs

Database changes (run sql/migration_drop_pc_tables.sql on prod):
- Drop pc, pc_backup_phase2, pc_to_machine_id_mapping tables
- Rename pcid columns to machineid in machineoverrides, dualpathassignments, networkinterfaces
- Recreate 9 views to use machines.machineid instead of pcid
- Clean orphaned records and add FK constraints to machines table

ASP fixes:
- editprinter.asp: Fix CLng type mismatch when no printerid provided
- includes/sql.asp: Remove AutoDeactivateExpiredNotifications (endtime handles expiry)
- includes/leftsidebar.asp: Update fiscal week banner styling, remove dead Information link
- charts/warrantychart.asp: Use vw_warranty_status instead of pc table

Dashboard API renames (naming convention):
- shopfloor-dashboard: Update to use apishopfloor.asp, apibusinessunits.asp
- tv-dashboard: Rename api_slides.asp to apislides.asp

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tv-dashboard/index.html

@@ -92,7 +92,7 @@
         // Fetch slides from API
         async function fetchSlides() {
             try {
-                const response = await fetch('api_slides.asp');
+                const response = await fetch('apislides.asp');
                 if (!response.ok) throw new Error('API error');
 
                 const data = await response.json();