fix autocomplete endpoints in web framework #2224

[asukaminato0721]

Summary

part of #2224

Test Plan

[Copilot]

Pull request overview

Adds LSP support for FastAPI-style endpoints by offering URL path completions at HTTP client call sites and enabling go-to-definition from request path literals to the corresponding route handler.

Changes:

• Introduces endpoint_support module to collect route definitions from decorators and match them against client request literals.
• Wires endpoint completions into the completion pipeline and endpoint literal resolution into go-to-definition.
• Adds regression tests covering endpoint completion and endpoint go-to-definition.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pyrefly/lib/state/lsp/endpoint_support.rs	New endpoint discovery/matching logic for completions + definition lookup.
pyrefly/lib/lsp/wasm/completion.rs	Calls add_endpoint_completions during completion generation.
pyrefly/lib/state/lsp.rs	Registers the new module and hooks endpoint literal definition lookup into go-to-definition.
pyrefly/lib/test/lsp/completion.rs	Adds a completion test asserting endpoint paths are suggested for client.get/post("").
pyrefly/lib/test/lsp/definition.rs	Adds a definition test asserting go-to-definition from client.get("/users") lands on the route function.

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[github-actions]

According to mypy_primer, this change doesn't affect type check results on a corpus of open source code. ✅