Feat/playwright e2e ci 343 rebase

[Francis6-git]

Re-enabling the Playwright end-to-end integration flow from closed PR #343.

This branch handles E2E stream lifecycles without local state bloat. It sets up an isolated environment pipeline via GitHub Actions using matrix configuration structures optimized directly alongside recent updates to main. Local execution test results and raw HTML reports have been explicitly stripped from tracking trees and isolated inside .gitignore.

[ogazboiz]

hey, main has moved significantly today (10+ PRs merged including the JWT test fix and various backend fixes). your branch's CI failure is on a stale base. please rebase:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

main is green right now, so CI should clear on the rebased commit.

[ogazboiz]

heads up: main's ci was broken (the Backend CI and Backend Docker Image CI jobs) until the fixes in #969 and #974 just landed, so the red backend/docker checks on this pr are almost certainly stale, they ran against the broken main. please rebase to re-test against the now-green main: git fetch origin && git rebase origin/main && git push --force-with-lease. once it's green i'll review and merge. (if a non-backend check like Frontend CI is still red after the rebase, that part is a real issue worth a look, since frontend ci was passing on main.)

[Francis6-git]

Thank you @ogazboiz for bringing it up, I've already forgotten that I made this PR to be honest.