feat(proxy): support multi-level navigation from decompiled JAR classes

[FanXingChunShui]

Summary

When JDTLS resolves a symbol that lives inside a JAR, it returns jdt:// URIs. java-lsp-proxy already rewrites those into temporary decompiled .java files so Zed can open them, but navigation then stopped: Zed sends follow-up requests against the temporary file:// URI, which JDTLS does not understand.

This PR adds the reverse half of that mapping so navigation can continue from one decompiled class into another.

Changes

• proxy-common: add file_uri_to_path (inverse of path_to_file_uri).
• proxy (decompile.rs): persist a file:// -> jdt:// mapping as a <name>.java.jdt-uri sidecar next to each cached decompiled source.
• proxy (main.rs):
  • rewrite incoming textDocument request URIs back from file:// to jdt:// before forwarding to JDTLS;
  • suppress didOpen/didChange/didSave/didClose for decompiled-source worktrees so JDTLS never treats them as editable project files.

The mapping is stored on disk rather than in memory because Zed opens decompiled files in their own worktree, which spawns a fresh java-lsp-proxy process.

Validation

• cargo test -p proxy-common -p java-lsp-proxy: 53 + 11 tests pass (including 5 new tests).
• cargo clippy -p proxy-common -p java-lsp-proxy --all-targets: clean.
• cargo fmt --all: clean.
• cargo check -p gradle-lsp-bridge: passes.
• Manually verified in Zed that follow-up navigation from a decompiled JAR class now works.

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[FanXingChunShui]

@cla-bot check

[cla-bot]

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[tartarughina]

Consider to use set_file_name for a more streamlined operation

[tartarughina]

@FanXingChunShui Could you point to a readily available example where the issue you are addressing here exists?
I'd like to try the change myself before approving.