fix(providers): count apikey connections for freeTier providers

openrouter, nvidia, gemini lack authModes, so dualAuthTypes on the
providers page defaulted to "oauth" and their apikey connections showed
as "No connections" on the freeTier card.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

open-sse/providers/registry/gemini.js

@@ -16,6 +16,8 @@ export default {
     },
   },
   category: "freeTier",
+  authType: "apikey",
+  authModes: ["apikey"],
   mediaPriority: 1,
   transport: {
     baseUrl: "https://generativelanguage.googleapis.com/v1beta/models",

open-sse/providers/registry/nvidia.js

@@ -15,6 +15,8 @@ export default {
     },
   },
   category: "freeTier",
+  authType: "apikey",
+  authModes: ["apikey"],
   transport: {
     baseUrl: "https://integrate.api.nvidia.com/v1/chat/completions",
     validateUrl: "https://integrate.api.nvidia.com/v1/models",

open-sse/providers/registry/openrouter.js

@@ -15,6 +15,8 @@ export default {
     },
   },
   category: "freeTier",
+  authType: "apikey",
+  authModes: ["apikey"],
   transport: {
     baseUrl: "https://openrouter.ai/api/v1/chat/completions",
     thinkingFormat: "openai",