feat(model-adapter): add remote model selection

- Fetch and normalize OpenAI and Anthropic model lists through the proxy service.
- Add searchable multi-model selection with localized UI and persisted adapter mappings.
- Cover endpoint resolution, authentication, pagination, and response parsing.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/i18n/locales/en-US.json

@@ -18,6 +18,7 @@
   "15d124b200ddabed": "Maximum number of context tokens the model can accept in a single request. Leave blank to use the default.",
   "185aebe19c77425d": "{0} must be a JSON object",
   "18b7312022cd1840": "Start Service",
+  "1afed6a81a2512d2": "Select model",
   "1baddde657dd2720": "Current outbound requests use system proxy",
   "1bc77f5ab979f4c1": "Add Model Settings",
   "1c631615c1d85c9e": "Log in to Cursor",
@@ -29,6 +30,7 @@
   "281eb6d08c9960d0": "{0} thinking budget token must be a positive integer",
   "28aeffc70ceb4267": "Change the display language for this interface. The setting takes effect immediately and is saved on this device.",
   "2a24519398684ed5": "Visit Homepage",
+  "2c18d5e2d70b45db": "Model prefix",
   "2cd0f3be8738a86c": "Cancel",
   "2d706f7981b45a7b": "Local settings saved",
   "2f9daa828907b93f": "Delete",
@@ -44,8 +46,10 @@
   "37d23612f78a2e63": "Restart Now to Update",
   "392d0dceb45998d3": "Extreme",
   "393df9bb13ea4900": "Hit",
+  "3a5040b68abf75f9": "Select all",
   "3ab8cc15939f3b5c": "Log out",
   "3af7e5489e61ea51": "Refreshing",
+  "3b2e5f2fba1bcbc7": "Enter the API address and access key",
   "3c2a9f9901109e75": "{0} type only supports OpenAI or Anthropic",
   "3d13868593ae4eeb": "Interface Language",
   "3d52574ce1500561": "Not connected",
@@ -69,6 +73,7 @@
   "58c6b0935a7216da": "Failed to open contributor profile",
   "593a972852ba0004": "Cursor Assistant | Permanently Free | Custom API",
   "59a2195a01a8b35b": "{0} must be a valid JSON object",
+  "5a5c8318ef649672": "{0} selected",
   "5aa8f5590c940829": "Non-cache Input: {0}",
   "5beb1206c532729f": "Maximum number of tokens allowed in a single response. Leave blank to use the default.",
   "5d1687a4a41883fd": "Stopping...",
@@ -95,8 +100,10 @@
   "737225e2904673fc": "Estimated output tokens: {0}",
   "7520bd50a5ee5471": "Stop testing {0}/{1}",
   "753d8bb0da9913ce": "Duplication failed",
+  "75b5f4c68c79322c": "Select at least one model to save",
   "774d6e1b7cb89751": "Default Definition",
   "77c9e582e85583af": "Test failed",
+  "7923d007483ae04c": "No models to save",
   "7a26bf794e9fb6bf": "Used only for display in the UI, so you can distinguish different models.",
   "7b6187c41e88b70c": "Testing...",
   "7bf8e2c07e084d09": "Model Editor",
@@ -106,15 +113,16 @@
   "80296f4aa3f4543b": "Cache Read/Write",
   "81123c56d5d880d0": "API Key",
   "8139cb3dd11f5a67": "When enabled, the JSON object will override the final request headers. Duplicate headers are determined by this field, and values must be strings.",
+  "826c0e5a4407befa": "You can select multiple models. Only selected models will be saved, with one configuration generated for each model.",
   "83be9cac28873059": "Cursor Control Plane Account",
   "8672864e90417138": "Max",
   "86df7ec743047234": "Service running",
+  "891bfee3bbe52d3c": "Enter a model ID",
   "899add6275682210": "Uses 200000 by default when left blank",
   "8a4ef3e48e4e8a5a": "Enabled",
   "8c1935935600e336": "Model Test",
   "8cbcf741e727dbf7": "Model Settings",
   "8d1de152be6360ce": "Valid ratio: {0}",
-  "8e2dc7b0d2e8f6f8": "e.g. OpenAI - GPT-4.1",
   "8f6f8d979c981ced": "Copied",
   "8f8baf5d18dd0492": "When enabled, the JSON object will override the OpenAI request body. Duplicate fields are determined by this field. OpenAI service_tier supports auto, default, flex, scale, priority; priority can be used for high-priority/Fast scenarios.",
   "8faa670b512b6b9b": "Open Model Settings",
@@ -160,6 +168,7 @@
   "b571037dc396a00c": "Total request tokens include both prompt and model output.",
   "b765005f69fa971f": "e.g. gpt-4.1",
   "b76a22622020f849": "Select interface protocol endpoint. When selecting 'Custom Path', please enter the complete request URL in the API address bar (including the /chat/completions or /responses suffix). The system will automatically detect the protocol type based on the trailing segment.",
+  "b7ceef2fbfeb4a85": "e.g. GPT-5",
   "b870928f8f9a24c4": "API Endpoint",
   "b90a8ac9c488ce46": "Select language",
   "ba3c66f90fd11725": "System proxy identified",
@@ -173,6 +182,7 @@
   "c3d46b387eeadb23": "This only logs the Cursor account out of cursor-byok; it does not log out of the Cursor client. Continue?",
   "c5af02060847d167": "Thinking effort for Anthropic adaptive thinking. Requests will consistently use the new thinking.type=adaptive.",
   "c69f5bce63b9f14c": "Settings Folder",
+  "c72d5dc20cd27118": "{0} / {1} models selected",
   "c8a52b66651d294c": "Failed to log out",
   "c8c14507b2d37395": "Reasoning Effort",
   "c98e118e0a43f078": "Model",
@@ -206,6 +216,7 @@
   "e4c0daa3c4bea691": "Thanks to @aike0210 for contributing the Cursor control-plane account feature.",
   "e53580f8031f13c0": "Complete login in the browser, then return to Cursor and reopen the plugin marketplace",
   "e552c2accdbf5178": "Add Model",
+  "e6943d5cbfb863e0": "Fetching models...",
   "e6faccfddce722e8": "Cache read tokens: {0}",
   "e8a0a6053998ebfa": "Logged in",
   "eaffd48cd2ea9f1a": "e.g. https://api.anthropic.com",
@@ -218,6 +229,7 @@
   "f3a76d896853c1df": "Miss",
   "f3fae6cccb9004b1": "Custom header name cannot be empty",
   "f474a4108aba4c4c": "Stop Service",
+  "f4d4bae588c4c0ff": "Deselect all",
   "f4f0ead1116b5b62": "Enable",
   "f56c6c82203b33f6": "Notice",
   "f61e03f047b786d5": "{0} max output tokens must be a positive integer",