feat(dashboard): add model/status/account/api-key filters to usage details tab

- Add apiKey column to requestDetails (schema v2 + migration 002)
- Persist masked API key via buildRequestDetail across chatCore handlers
- Add getRequestDetails apiKey filter + distinct models/apiKeys/statuses helpers
- New /api/usage/filters endpoint returning grouped connections per provider
- Group account dropdown by provider using <optgroup>; add Status column
  with success/error badge to the details table

Co-authored-by: CommandCodeBot <noreply@commandcode.ai>

open-sse/handlers/chatCore/requestDetail.js

@@ -57,11 +57,21 @@ export function extractUsageFromResponse(responseBody) {
   return null;
 }
 
+// Mask API keys before they reach the requestDetails data blob / DB column.
+// Only the prefix is kept — enough to distinguish keys without leaking them.
+export function maskApiKey(key) {
+  if (!key || typeof key !== "string") return undefined;
+  const trimmed = key.trim();
+  if (trimmed.length <= 8) return trimmed.charAt(0) + "***";
+  return trimmed.slice(0, 8) + "***";
+}
+
 export function buildRequestDetail(base, overrides = {}) {
   return {
     provider: base.provider || "unknown",
     model: base.model || "unknown",
     connectionId: base.connectionId || undefined,
+    apiKey: maskApiKey(base.apiKey),
     timestamp: new Date().toISOString(),
     latency: base.latency || { ttft: 0, total: 0 },
     tokens: base.tokens || { prompt_tokens: 0, completion_tokens: 0 },