feat: bump duckdb and use our own wrappers

[GordonSmith]

No description provided.

[Copilot]

Pull request overview

This PR upgrades DuckDB from v1.4.0 to v1.4.3 and replaces the dependency on @duckdb/duckdb-wasm with custom C++ bindings compiled via vcpkg. The change provides more direct control over DuckDB's WASM compilation, enables statically linked extensions (json, core-functions), and simplifies the API to use synchronous calls instead of async Workers.

Key changes:

• Custom C++ Embind wrappers expose DuckDB's C++ API directly to JavaScript
• vcpkg overlay configuration for building DuckDB with specific extensions
• Simplified synchronous API replacing the previous async Worker-based approach

Reviewed changes

Copilot reviewed 24 out of 26 changed files in this pull request and generated 15 comments.

Show a summary per file

File	Description
vcpkg.json	Adds DuckDB as a vcpkg dependency with json and core-functions extensions
vcpkg-overlays/duckdb/*	Custom vcpkg port configuration for building DuckDB v1.4.3 with patches
packages/duckdb/src-cpp/*	New C++ Embind bindings providing JavaScript API for DuckDB
packages/duckdb/src/duckdb.ts	Refactored to use custom wrappers instead of @duckdb/duckdb-wasm
packages/duckdb/src/wasm-library.ts	Base class for WASM memory management utilities
packages/duckdb/tests/duckdb.spec.ts	Updated tests for new synchronous API
packages/duckdb/tests/duckdb.browser.spec.ts	Removed browser-specific tests (merged into main test suite)
packages/duckdb/package.json	Removed @duckdb/duckdb-wasm dependency, updated build scripts
packages/duckdb/esbuild.js	Changed from browserTpl to neutralTpl for platform-agnostic bundling
tests/bundlers/src/browser-test-utils.js	Updated DuckDB test to use new synchronous API
scripts/cpp-install-emsdk.sh	Installs npm dev dependencies in Emscripten for node binary support
packages/tsconfig.json	Added ES2020.BigInt library for BigInt support
CMakeLists.txt	Added duckdb package to build targets
README.md	Updated DuckDB version from v1.4.0 to v1.4.3
.github/copilot-instructions.md	Added CMake and Embind development guidelines
.vscode/settings.json	Cleaned up AI assistant configuration
.gitignore	Added screenshots/ directory
package.json, package-lock.json	Minor dependency version updates (@eslint/js, @types/node)