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/streamingHandler.js

@@ -230,6 +230,7 @@ export async function handleStreamingResponse({
 				provider,
 				model,
 				connectionId,
+				apiKey,
 				latency: { ttft: 0, total: Date.now() - requestStartTime },
 				tokens: { prompt_tokens: 0, completion_tokens: 0 },
 				request: extractRequestConfig(body, stream),
@@ -293,6 +294,7 @@ export function buildOnStreamComplete({
 					provider,
 					model,
 					connectionId,
+					apiKey,
 					latency,
 					tokens: usage || { prompt_tokens: 0, completion_tokens: 0 },
 					request: extractRequestConfig(body, stream),