🔧 chore: use utility function to build webpack config

[SimonShiki]

Depends #182

Description

This PR maintains a universal set of webpack configuration rules and exposes a config builder to enable other packages to rapidly construct webpack configuration files.

Proposed Changes

1. Add clipcc-infra package that used to infrastructure-related jobs, such as making webpack configuration.
2. A utility function has been added to simplify the construction of webpack configurations.
3. Automatic aliasing & rule merging for workspace packages. I introduced webpack.manifest.js to support this.

Test Coverage

See /packages/infra/tests

Additional Context

None

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Latest commit:	7af8f23
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[Copilot]

Pull request overview

This PR introduces a shared WebpackConfigBuilder utility (new packages/infra) and migrates multiple package-level webpack configs to a manifest-driven setup to reduce duplication and centralize defaults.

Changes:

• Add packages/infra with a manifest-based webpack configuration builder and initial unit tests/docs.
• Refactor webpack configurations for vm/storage/render/paint/l10n/gui/block/audio to use webpack.manifest.js + the shared builder.
• Update workspace scripts/dependencies/lockfile to build and use the new infra package.

Reviewed changes

Copilot reviewed 30 out of 31 changed files in this pull request and generated 17 comments.

Show a summary per file

File	Description
yarn.lock	Updates lockfile for new/updated build dependencies.
packages/vm/webpack.manifest.js	Adds VM webpack manifest consumed by the shared builder.
packages/vm/webpack.config.js	Refactors VM webpack config to use WebpackConfigBuilder and the manifest.
packages/vm/package.json	Adjusts VM dependencies/peerDependencies (incl. sb1 converter bump).
packages/storage/webpack.manifest.js	Adds storage webpack manifest (incl. target/plugins).
packages/storage/webpack.config.js	Refactors storage webpack config to use shared builder and generate multiple targets.
packages/render/webpack.manifest.js	Adds render webpack manifest.
packages/render/webpack.config.js	Refactors render webpack config to use shared builder.
packages/paint/webpack.manifest.js	Adds paint webpack manifest (React/TS + asset rules).
packages/paint/webpack.config.js	Refactors paint webpack config to use shared builder.
packages/l10n/webpack.manifest.js	Adds l10n webpack manifest.
packages/l10n/webpack.config.js	Refactors l10n webpack config to use shared builder.
packages/infra/tsconfig.dts.json	Adds TS config to emit d.ts from JS for the infra package.
packages/infra/test/targets.test.js	Adds initial tests for infra builder behavior.
packages/infra/src/index.js	Implements WebpackConfigBuilder and manifest normalization/defaults.
packages/infra/package.json	Defines new workspace package clipcc-webpack-configuration.
packages/infra/README.md	Documents intended infra package usage/API.
packages/infra/LICENSE	Adds license for infra package.
packages/infra/.gitignore	Adds infra package ignore rules.
packages/infra/.gitattributes	Adds infra package attributes (LF normalization).
packages/infra/.editorconfig	Adds infra package editor configuration.
packages/gui/webpack.manifest.js	Adds GUI webpack manifest (plugins/rules/workspacePackages).
packages/gui/webpack.config.js	Refactors GUI webpack config to use shared builder + manifest.
packages/block/webpack.manifest.js	Adds block webpack manifest (devtool, TS + extra rules).
packages/block/webpack.config.js	Refactors block webpack config to use shared builder + manifest.
packages/block/eslint.config.mjs	Updates eslint config to include webpack.manifest.js.
packages/audio/webpack.manifest.js	Adds audio webpack manifest.
packages/audio/webpack.config.js	Refactors audio webpack config to use shared builder + manifest.
packages/audio/package.json	Updates audio main entry path to match new dist output structure.
package.json	Ensures infra build runs as part of build:full and adds an infra workspace script alias.
UPSTREAM	Records upstream reference for scratch-webpack-configuration.

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[Copilot]

normalizeManifest() forces a default target: 'web', so get() will always emit a target field even when callers did not specify one. This contradicts the new unit test expectation for a "generic" config without a target, and can change webpack defaults/behavior. Consider leaving target undefined unless explicitly provided (or update the tests/docs to match the intended behavior).

[SimonShiki]

Since we now use rules-inheritance-webpack-plugin, seems this pr becomes unnecessary now