Fix Go to Definition for cached BIG archives

[ViTeXFTW]

Summary

A lowercase Windows drive letter in baseIniRoots caused the scanner to store big:///c:/... while definition navigation looked up big:///C:/.... The archive was indexed, but Go to Definition returned no location.

• Share URI normalization between scanning and client requests so definitions and archived source text use the same keys.

• Bump the cache producer version so older records rebuild automatically.

• Add regressions for navigation into and within archived INI files, including a server restart that confirms the saved cache is reused, VS Code URI encoding, and exact definition ranges.

• Closes [Feature] Goto definition for cached files #66.

Tests

Passed locally on Windows:

• cargo test --locked
• cargo test --locked -p zerosyntax-server big_uri_normalizes_configured_drive_letter
• Full LSP stdio suite: crates/server/tests/e2e.py
• Cold-cache and warm-cache regression: crates/server/tests/e2e_big_cache.py
• cargo clippy --locked --all-targets --all-features -- -D warnings
• cargo fmt --all --check
• git diff --check

Checklist

• I kept the change focused.
• I ran the relevant checks or explained why they were skipped.
• I did not commit generated artifacts, game source, corpus data, or secrets.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with URI identity consistently applied across scanning and client lookups and regression coverage for persisted cache reuse.

Summary

• Moves file and BIG URI canonicalization into a shared server module.
• Canonicalizes BIG archive entry URIs before indexing and caching.
• Advances the cache producer identity to rebuild incompatible records.
• Exercises definition navigation, virtual-file reads, URI encoding, exact ranges, and cache reuse across a server restart.