feat: filter inbounds and clients by node (#4997)

Multi-node panels had no way to narrow the inbounds or clients lists to
a single node. Add a node filter to both pages:

- Inbounds: a toolbar select (All / Local / each node) that filters the
  list client-side; shown only when the panel has nodes or node-attached
  inbounds.
- Clients: a Nodes multi-select in the filter drawer. Node selections
  are mapped onto inbound IDs client-side and fed through the existing
  inbound CSV paging parameter, so the paging backend is untouched; an
  impossible id (-1) is sent when no inbound matches so the filter
  yields an honest empty result. InboundOption now carries nodeId to
  make the mapping possible.

The local panel is selectable via a 0 sentinel (inbounds without a
nodeId). New i18n keys in all 13 locales.

frontend/public/openapi.json

@@ -1459,6 +1459,11 @@
             "example": 1,
             "type": "integer"
           },
+          "nodeId": {
+            "description": "Hosting node; nil for this panel's own inbounds. Lets the clients\npage map a node filter onto inbound IDs (#4997).",
+            "nullable": true,
+            "type": "integer"
+          },
           "port": {
             "example": 443,
             "type": "integer"
@@ -2244,6 +2249,7 @@
                   "obj": [
                     {
                       "id": 1,
+                      "nodeId": null,
                       "port": 443,
                       "protocol": "vless",
                       "remark": "VLESS-443",