Docs: deploy-web-aot quickstart (phpc deploy + PHPC_DEPLOY_ROOT)

[PurHur]

Summary

• Add docs/deploy-web-aot.md (≤200 lines): build → phpc deploy → dist layout → PHPC_DEPLOY_ROOT → illustrative nginx CGI, with 002-StaticWeb (green) and 003-MiniWebApp (blocked AOT: Native user-class object model for phpc build --project #568) sections.
• Link from README “Developing web apps” and README.deploy via ProjectDeploy::readmeDeployContent().
• Cross-links Web: CGI/1.1 request driver (stdin/stdout, env, Status line) #50, Web: FastCGI request loop adapter (nginx / php-fpm compatible) #173, Docs: Production deployment guide (nginx + AOT binary + CGI/FastCGI) #445, AOT: phpc deploy bundles binary, public/, assets/, and phpc.json into dist/ #609, AOT: Runtime include() of deploy-root PHP via phpc_deploy_path() #623, AOT: Native user-class object model for phpc build --project #568, AOT: MiniWebApp dist-layout smoke with PHPC_DEPLOY_ROOT (post #609 deploy) #612, Web: AOT CGI wrapper for phpc-built binaries (production nginx spawn) #665.

Test plan

• grep deploy-web-aot README.md
• Docker tar-pipe smoke: phpc build --project examples/002-StaticWeb → phpc deploy → test -x bin/app + grep PHPC_DEPLOY_ROOT README.deploy
• ./script/docker-ci-local.sh fast --filter PhpcDeployTest

Closes #635

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