✨ scaffold @datadog/browser-rum-vue package

[mormubis]

Motivation

First of four PRs adding Vue 3 RUM integration. This one is just the empty package shell and monorepo plumbing. Nothing user-facing yet, but the next three PRs need this to exist first.

Changes

Creates the `@datadog/browser-rum-vue` package skeleton: `package.json`, empty entry stubs, the `vue-router-v4` sub-entry for the router integration in PR 3.

The rest is infrastructure:

• tsconfig path mappings and ESLint allowlists so the monorepo tooling knows about the new package
• license CSV entries for `vue`, `vue-router`, `@vue/test-utils`, `@vitejs/plugin-vue`
• `swc-loader` rule to transpile vue-router for BrowserStack. Vue-router ships its devtools as a `.mjs` file with optional chaining, which older BS browsers can't parse. Same fix as the React packages already in that config.

Test instructions

No tests here, it's all plumbing. The test suite should pass unchanged.

Checklist

• Tested locally
• Tested on staging
• Added unit tests (nothing to test, empty stubs)
• Added e2e/integration tests
• Updated documentation

[mormubis]

Vue-router ships its devtools as a .mjs with optional chaining, older BS browsers blow up on it. Already transpiling React packages here for the same reason, vue-router is the same fix.

[cit-pr-commenter-54b7da]

Bundles Sizes Evolution

📦 Bundle Name	Base Size	Local Size	𝚫	𝚫%	Status
Rum	175.00 KiB	175.00 KiB	0 B	0.00%	✅
Rum Profiler	6.16 KiB	6.16 KiB	0 B	0.00%	✅
Rum Recorder	27.46 KiB	27.46 KiB	0 B	0.00%	✅
Logs	56.80 KiB	56.80 KiB	0 B	0.00%	✅
Flagging	944 B	944 B	0 B	0.00%	✅
Rum Slim	130.64 KiB	130.64 KiB	0 B	0.00%	✅
Worker	23.63 KiB	23.63 KiB	0 B	0.00%	✅

🚀 CPU Performance

Action Name	Base CPU Time (ms)	Local CPU Time (ms)	𝚫%
RUM - add global context	0.0046	0.0044	-4.35%
RUM - add action	0.0127	0.0154	+21.26%
RUM - add error	0.0135	0.0132	-2.22%
RUM - add timing	0.0025	0.0028	+12.00%
RUM - start view	0.0122	0.0126	+3.28%
RUM - start/stop session replay recording	0.0007	0.0011	+57.14%
Logs - log message	0.0144	0.0226	+56.94%

🧠 Memory Performance

Action Name	Base Memory Consumption	Local Memory Consumption	𝚫
RUM - add global context	27.37 KiB	27.23 KiB	-146 B
RUM - add action	53.07 KiB	52.34 KiB	-748 B
RUM - add timing	25.97 KiB	26.52 KiB	+562 B
RUM - add error	55.69 KiB	55.50 KiB	-186 B
RUM - start/stop session replay recording	25.52 KiB	25.40 KiB	-121 B
RUM - start view	462.52 KiB	462.19 KiB	-345 B
Logs - log message	44.79 KiB	45.14 KiB	+360 B

🔗 RealWorld

[datadog-prod-us1-5]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 77.21% (+0.00%)

_{This comment will be updated automatically if new data arrives.
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