feat: migrate warnings/errors to structured diagnostics via logs-sdk

[antfu]

Description

Migrate all node-side console.warn/console.error/throw new Error patterns to structured diagnostics using @antfu/experimental-logs-sdk. Each error/warning now gets a unique code (DTK0001–DTK0032 for core/rpc, RDDT0001–RDDT0002 for rolldown) with auto-generated docs URLs and ANSI-formatted console output.

• Add @antfu/experimental-logs-sdk (^0.0.3) as dependency to rpc, core, and rolldown packages
• Create diagnostics.ts in each package with defineDiagnostics() + createLogger() — flat code keys like DTK0001 (no prefix option)
• Migrate 34 error/warning sites across 19 source files to use the logger
• Add 35 VitePress documentation pages under docs/errors/ (one per code + index) with cause, fix, examples, and source links
• Add "Error Reference" sidebar section to VitePress config
• Update test assertions in packages/rpc/src/dumps.test.ts to match new CodedError message format

Linked Issues

Additional context

• Only node-side code is migrated; client-side Vue components/webcomponents are excluded
• Code prefixes: DTK = DevTools Kit (rpc + core), RDDT = Rolldown DevTools, VDT reserved for the vite package
• The rpc package uses plainFormatter (no ansis dependency); core and rolldown use ansiFormatter

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commit: 35ff95d