chore: move every template to the current Seamless SDKs

[Bccorb]

Closes #123. Part of the v0.19 release (fells-code/seamless-auth-api#385).

What

Template	Package	From	To
react-vite, react-oauth, fullstack/nextjs	@seamless-auth/react	^0.15.2	^0.17.1
mobile/expo	@seamless-auth/react-native	^0.2.2	^0.3.2
web/angular	@seamless-auth/angular	^0.2.0	^0.3.1
web/vue	@seamless-auth/vue	^0.1.0	^0.2.1
web/svelte	@seamless-auth/svelte	^0.1.0	^0.2.1
api/express	@seamless-auth/express	^0.20.0	^0.21.0
api/fastify	@seamless-auth/fastify	^0.11.1	^0.12.0

Every lockfile resolves @seamless-auth/client 0.7.0, which carries the same-origin authorizedFetch fix (fells-code/seamless-auth-react#188) that kept the Next.js starter on react 0.15 in #124. No template code changed. Minor changeset.

Checks

Each template: npm install, npm run check (typecheck, lint, format, tests) and npm run build all exit 0: express, fastify, fullstack/nextjs, mobile/expo, web/angular, web/react-oauth, web/react-vite, web/svelte, web/vue. Root npm run validate and npm run format:check: pass. The conformance run on this PR exercises the Next.js starter's roles case that failed on react 0.16.