feat(config): settings schema with vscode integration

[hkimw]

Summary

• add a checked sv-ide settings schema for panel data sources, refresh interval, and log level
• mirror the schema into the VS Code prototype settings contribution and normalize the new settings at runtime
• cover schema/manifest alignment and extension config reads in tests

Refs #126
Refs #127

Tests

• node editors/vscode-prototype/test/extension-config.test.mjs
• node editors/vscode-prototype/test/extension-manifest.test.mjs
• node editors/vscode-prototype/test/extension-entrypoint.test.mjs
• python3 schema validity check for schema/sv-ide-settings-v0.json
• bash scripts/vscode-adapter-smoke.sh
• pytest -q