fix: 2.0.0-exp.0 fails to load on install (undeclared fast-decode-uri-component, removed elysia internals)

[thupi]

This PR fixes two independent issues that make @elysia/static@2.0.0-exp.0 fail at import time on any consumer install:

Cannot find module './node_modules/fast-decode-uri-component/index.mjs'
  from '.../node_modules/@elysia/static/dist/index.mjs'

Reproducible in an empty project with bun i elysia@2.0.0-exp.42 @elysia/static@2.0.0-exp.0 — both the ESM and CJS entries fail the same way.

1. fast-decode-uri-component is only a devDependency

The unbundle: true build externalizes it by relative path (./node_modules/fast-decode-uri-component/...) because it isn't a runtime dependency — that path isn't in the published tarball, and consumers never install the package (1.x wasn't affected because the old build inlined it). Moving it to dependencies makes tsdown externalize it by bare specifier:

- import { require_fast_decode_uri_component } from "./node_modules/fast-decode-uri-component/index.mjs";
+ import fastDecodeURI from "fast-decode-uri-component";

2. Built against elysia internals removed during the exp series

With issue 1 shimmed away, the ESM entry still fails to link against current exp:

Export named 'MethodMap' not found in module '.../elysia/dist/constants.mjs'.

src/index.ts imports MethodMap from elysia/constants and reads app.history, both removed in current 2.0 exp, while the peer range allows >= 2.0.0-exp.23. Replaced with the app.routes declarations, which have the same { method, path } shape across the supported range (verified on exp.23 and exp.42):

app.routes?.find(
    (route) => route.method === 'GET' && route.path === `${prefix}/*`
) === undefined

Validation

• bun test: 141 pass / 0 fail on this branch (lockfile's exp.23)
• npm pack of this branch installed into a clean project on elysia@2.0.0-exp.42: the plugin now loads and serves files, with fast-decode-uri-component installed automatically as a regular dependency
• happy to attach the minimal reproduction (3 scripts, clean directory) if useful

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