feat(caps): user-registered models trust upstream vision instead of stripping media

src/sse/handlers/chat.js

@@ -7,7 +7,8 @@ import {
   extractApiKey,
   isValidApiKey,
 } from "../services/auth.js";
-import { getSettings } from "@/lib/localDb";
+import { getSettings, getCustomModels } from "@/lib/localDb";
+import { capabilitiesFromServiceKind } from "open-sse/providers/capabilities.js";
 import { getModelInfo, getComboModels } from "../services/model.js";
 import { handleChatCore } from "open-sse/handlers/chatCore.js";
 import { DEFAULT_HEADROOM_URL } from "@/lib/headroom/detect";
@@ -259,6 +260,13 @@ async function handleSingleModelChat(body, modelStr, clientRawRequest = null, re
     // Use shared chatCore
     const chatSettings = await getSettings();
     const providerThinking = (chatSettings.providerThinking || {})[provider] || null;
+    // User-registered models (Provider page → "Add Model") trust upstream: keep
+    // images/media in the request instead of stripping by static-capability guess.
+    let capsOverride = null;
+    try {
+      const cm = (await getCustomModels()).find((m) => m.providerAlias === provider && m.id === model);
+      if (cm) capsOverride = { ...capabilitiesFromServiceKind(cm.type), vision: true };
+    } catch { /* fail-open to static caps */ }
     const result = await handleChatCore({
       body: { ...body, model: `${provider}/${model}` },
       modelInfo: { provider, model },
@@ -284,6 +292,7 @@ async function handleSingleModelChat(body, modelStr, clientRawRequest = null, re
       pxpipeTransform: chatSettings.pxpipeEnabled ? await getPxpipeTransform() : null,
       onPxpipeEvent: appendPxpipeEvent,
       providerThinking,
+      capsOverride,
       // Detect source format by endpoint + body
       sourceFormatOverride: request?.url ? detectFormatByEndpoint(new URL(request.url).pathname, body) : null,
       onCredentialsRefreshed: async (newCreds) => {