feature: roadrunner v3 - v6 plugin line, connect-rpc control plane

[rustatian]

RoadRunner v3 beta line: tracks the v6 plugins and the Connect-RPC control plane. PHP-worker e2e paths stay red until spiral/roadrunner-worker v4 lands.

• module renamed to github.com/roadrunner-server/roadrunner/v3 (ldflags, Dockerfile, badge and release references updated)
• container: plugin line bumped to the /v6 betas (Connect-RPC RPC() (string, http.Handler) surface)
• internal/rpc: goridge net/rpc client replaced with an h2c HTTP/2 client factory for the Connect handlers (tcp:// and unix:// listeners)
• cli: workers, reset, jobs ported to the generated Connect clients (informer/resetter/jobs APIs); lib moved to config/v6
• e2e tests and helpers ported to the Connect clients

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[codecov]

Codecov Report

❌ Patch coverage is 13.63636% with 95 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.38%. Comparing base (e83e82d) to head (dcd8d43).

Files with missing lines	Patch %	Lines
internal/cli/workers/command.go	0.00%	25 Missing and 1 partial ⚠️
internal/cli/workers/render.go	0.00%	23 Missing ⚠️
internal/cli/reset/command.go	0.00%	13 Missing and 1 partial ⚠️
internal/rpc/client.go	51.72%	14 Missing ⚠️
internal/cli/jobs/subcommands.go	0.00%	10 Missing ⚠️
internal/cli/jobs/command.go	0.00%	7 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2356      +/-   ##
==========================================
+ Coverage   31.02%   31.38%   +0.35%     
==========================================
  Files          18       18              
  Lines         851      854       +3     
==========================================
+ Hits          264      268       +4     
+ Misses        548      547       -1     
  Partials       39       39              

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