feat: harden support, localize knowledge and add operator availability [skip ci]

Source-only publication of reviewed commit 64e96a7f423673dc29ad56485be9fc79bce8af1c.

Passed in isolation: focused frontend/backend tests, race checks, TypeScript typecheck, lint, Go compilation, Flowgram build, and deterministic SDK build/tests.

Not accepted as a production release: Next.js export/native assembly remains blocked by environment memory limits; browser interaction and MySQL staging acceptance remain unverified. No production server, database/schema, runtime configuration, deployment, release tag, or workflow execution was performed.

Expected source tree: 0a4a7528e9.

web/components/support-chat/connection-status.tsx

@@ -1,3 +1,4 @@
+// Modified in this independent fork for support availability; see docs/hardening/README.md.
 "use client"
 
 import { Badge } from "@/components/ui/badge"
@@ -20,16 +21,16 @@ export function SupportChatConnectionStatus({ status }: SupportChatConnectionSta
   return (
     <Badge
       variant="outline"
-      className={cn("h-6 gap-2 px-2.5 text-[11px] font-medium shadow-sm", toneClass)}
+      className={cn("h-6 gap-2 px-2.5 text-[11px] font-medium", toneClass)}
     >
       <span
         className={cn(
           "inline-block size-2 rounded-full",
           status === "connected"
-            ? "bg-emerald-500 shadow-[0_0_0_4px_rgba(16,185,129,0.14)]"
+            ? "bg-emerald-500"
             : status === "connecting"
-              ? "bg-amber-500 shadow-[0_0_0_4px_rgba(245,158,11,0.16)]"
-              : "bg-muted-foreground shadow-[0_0_0_4px_rgba(148,163,184,0.14)]"
+              ? "bg-amber-500"
+              : "bg-muted-foreground"
         )}
       />
       <span>{t(`supportChat.${status}`)}</span>