feat: Implement compatibility strategies for responses and chat endpoints

- Added `routeCompatibility.ts` to handle response compatibility for different endpoints.
- Introduced `chatEndpointStrategy.ts` to manage chat endpoint recovery and downgrading logic.
- Created tests for chat formats and input file handling in `chatFormatsCore.test.ts` and `inputFile.test.ts`.
- Developed `endpointCompatibility.ts` to define compatibility checks and header building for various endpoints.
- Implemented protocol lifecycle management in `protocolLifecycle.ts` and corresponding tests in `protocolModel.test.ts`.
- Enhanced tooltip functionality with a new `TooltipLayer` component and associated tests.
- Refactored existing components to improve tooltip handling and ensure proper rendering in the application.

src/server/test-fixtures/protocol/chat-inline-think.sse

@@ -0,0 +1,9 @@
+data: {"id":"chatcmpl-think","model":"upstream-gpt","choices":[{"delta":{"role":"assistant"},"finish_reason":null}]}
+
+data: {"id":"chatcmpl-think","model":"upstream-gpt","choices":[{"delta":{"content":"<think>plan quietly</think>"},"finish_reason":null}]}
+
+data: {"id":"chatcmpl-think","model":"upstream-gpt","choices":[{"delta":{"content":"visible answer"},"finish_reason":null}]}
+
+data: {"id":"chatcmpl-think","model":"upstream-gpt","choices":[{"delta":{},"finish_reason":"stop"}]}
+
+data: [DONE]

src/server/test-fixtures/protocol/chat-missing-finish.sse

@@ -0,0 +1,3 @@
+data: {"id":"chatcmpl-eof","model":"upstream-gpt","choices":[{"delta":{"role":"assistant"},"finish_reason":null}]}
+
+data: {"id":"chatcmpl-eof","model":"upstream-gpt","choices":[{"delta":{"content":"tail before eof"},"finish_reason":null}]}

src/server/test-fixtures/protocol/messages-cumulative-text.sse

@@ -0,0 +1,16 @@
+event: message_start
+data: {"type":"message_start","message":{"id":"msg_dup_1","model":"upstream-gpt"}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","delta":{"type":"text_delta","text":"I'm Claude, an AI assistant made by Anthropic."}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","delta":{"type":"text_delta","text":"I'm Claude, an AI assistant made by Anthropic."}}
+
+event: content_block_delta
+data: {"type":"content_block_delta","delta":{"type":"text_delta","text":"I'm Claude, an AI assistant made by Anthropic."}}
+
+event: message_stop
+data: {"type":"message_stop"}
+
+data: [DONE]

src/server/test-fixtures/protocol/responses-failed-sparse.sse

@@ -0,0 +1,10 @@
+event: response.created
+data: {"type":"response.created","response":{"id":"resp_fail_1","model":"upstream-gpt","created_at":1706000000,"status":"in_progress","output":[]}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","output_index":0,"item":{"id":"msg_0","type":"message","role":"assistant","status":"in_progress","content":[]}}
+
+event: response.failed
+data: {"type":"response.failed","response":{"id":"resp_fail_1","model":"upstream-gpt","status":"failed","error":{"message":"upstream stream failed"}}}
+
+data: [DONE]

src/server/test-fixtures/protocol/responses-native-sparse.sse

@@ -0,0 +1,13 @@
+event: response.created
+data: {"type":"response.created","response":{"id":"resp_sparse_1","model":"upstream-gpt","created_at":1706000000,"status":"in_progress","output":[]}}
+
+event: response.output_item.added
+data: {"type":"response.output_item.added","output_index":0,"item":{"id":"msg_0","type":"message","role":"assistant","status":"in_progress","content":[]}}
+
+event: response.output_text.delta
+data: {"type":"response.output_text.delta","output_index":0,"item_id":"msg_0","delta":"hello world"}
+
+event: response.completed
+data: {"type":"response.completed","response":{"id":"resp_sparse_1","model":"upstream-gpt","status":"completed","usage":{"input_tokens":2,"output_tokens":4,"total_tokens":6}}}
+
+data: [DONE]