refactor: use ide.readFile instead of fs.readFile in static context service

[uinstinct]

Description

Use ide.readfile instead of fs.readfile in StaticContextService

resolves CON-4504

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• [] The relevant tests, if any, have been updated or created

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Summary by cubic

Refactored StaticContextService to use IDE file APIs for reading files and scanning directories, improving support for URIs and virtual workspaces. Addresses CON-4504 by routing file access through the IDE layer.

• Refactors
  • Replaced fs.readFile with ide.readFile and fs.readdir with ide.listDir using FileType.
  • Normalized paths via pathToFileURL/localPathOrUriToPath for consistent URI handling.
  • Removed fs/promises dependency; logic for skipping dirs and filtering TS extensions unchanged.

[cubic-dev-ai]

No issues found across 1 file

[sestinj]

@uinstinct I tried merging main into this branch but we still have a lot of test failures that must be coming from the changes here