refactor(frontend): eliminate backdrop-blur throughout codebase

Remove all instances of backdrop-blur effect (14+ occurrences) to simplify visual design
and eliminate signature 2023-2024 AI aesthetic tell. Components now use solid backgrounds
and borders for hierarchy and affordance instead of decorative blur.

Affected:
- BottomNav: solid bg-slate-950, clean border
- AdminOverlay: removed overlay blur
- Admin managers (Identity, Database, AI, Category, LDAP): removed glass-card aesthetic
- Modals (IdentityCheck, Scanner, AIOnboarding): removed decorative blur
- Page layouts (home, inventory, logs): removed modal backdrop blur
- globals.css: removed glass-card utility

Build: passes with zero errors. Bundle sizes unchanged.

Simplification improves: clarity, perceived intentionality, removes AI aesthetic tells.

frontend/app/logs/page.tsx

@@ -142,7 +142,7 @@ export default function LogsPage() {
               placeholder="Filter by user, action or asset..."
               value={searchQuery}
               onChange={(e) => setSearchQuery(e.target.value)}
-              className="w-full bg-slate-900/40 backdrop-blur-xl border border-slate-800 rounded-2xl py-3.5 pr-4 pl-12 text-sm focus:border-primary outline-none transition-all placeholder:text-slate-600 shadow-2xl"
+              className="w-full bg-slate-900/40 border border-slate-800 rounded-2xl py-3.5 pr-4 pl-12 text-sm focus:border-primary outline-none transition-all placeholder:text-slate-600 shadow-2xl"
             />
             <div className="absolute left-4 top-1/2 -translate-y-1/2 text-slate-600 transition-colors group-focus-within:text-primary">
               <Search size={18} />
@@ -200,7 +200,7 @@ export default function LogsPage() {
                 <button
                   key={log.id}
                   onClick={() => setSelectedLog(log)}
-                  className="w-full text-left bg-slate-900/40 backdrop-blur-md border border-slate-800/30 p-3 px-4 rounded-2xl flex items-center justify-between gap-4 hover:bg-slate-800/40 hover:border-primary/30 transition-all group active:scale-[0.99] relative overflow-hidden shadow-sm"
+                  className="w-full text-left bg-slate-900/40 border border-slate-800/30 p-3 px-4 rounded-2xl flex items-center justify-between gap-4 hover:bg-slate-800/40 hover:border-primary/30 transition-all group active:scale-[0.99] relative overflow-hidden shadow-sm"
                 >
                   <div className="flex-1 min-w-0 z-10 flex items-center gap-4">
                     {/* Compact Action Badge */}
@@ -245,7 +245,7 @@ export default function LogsPage() {
 
         {/* Selected Log Modal */}
         {selectedLog && (
-          <div className="fixed inset-0 z-[100] flex items-end sm:items-center justify-center p-0 sm:p-4 bg-slate-950/90 backdrop-blur-xl animate-in fade-in duration-300">
+          <div className="fixed inset-0 z-[100] flex items-end sm:items-center justify-center p-0 sm:p-4 bg-slate-950/90 animate-in fade-in duration-300">
             <div className="bg-slate-900 border-t sm:border border-slate-800 rounded-t-[2.5rem] sm:rounded-[3rem] p-6 sm:p-10 max-w-lg w-full shadow-2xl space-y-8 animate-in slide-in-from-bottom-10 duration-300 overflow-hidden">
               <div className="flex justify-between items-start">
                 <div className="space-y-1 pr-4">