feat(devtui): redesign overview tab with setup health report

[Soner (shyim)]

Summary

Redesigns the devtui overview tab into a two-column layout: a readonly project report on the left and a "User action" column with the watchers on the right (narrow terminals fall back to a stacked layout).

• Access table: Admin Access and Services merged into one table (Service / URL / Username / Password-Auth) with the Shop Admin login as the first row; credential-less services show no auth
• Setup health report: PHP version and memory limit are read from the PHP runtime the project actually uses (inside the container for docker environments); admin worker and Flow Builder log level are resolved from config/packages for the project's APP_ENV. Checks whose data source is unavailable are omitted rather than shown as failures
• Background processing moved to the left column, rendered with the same status dots as the health checks (this made tui.CheckboxRow dead code, removed)
• Clickable links: all URLs and the health check names are OSC 8 hyperlinks in the shared underlined link style; check names open the relevant Shopware docs page (anchors verified). Terminals without OSC 8 support show plain styled text
• Arrow-key focusing is reduced to the two watchers; services are no longer focus targets

Screenshots

Rendered at 120 columns:

Project details and readonly setup report.                        │  User action
                                                                  │
Shop                                                              │  Watchers
  Version               6.7.11.1                                  │    [ ] Admin         stopped
  Security updates      until 2028-02-28 (66 days left)           │    [ ] Storefront    stopped
  Environment           docker                                    │
  Shop URL              http://127.0.0.1:8000                     │
  Admin URL             http://127.0.0.1:8000/admin               │
──────────────────────────────────────────────────────────────────│
Access                                                            │
  Service      URL                           Username   Password / Auth
  Shop Admin   http://127.0.0.1:8000/admin   admin      shopware  │
  Adminer      http://127.0.0.1:9080         root       root      │
  Mailpit      http://127.0.0.1:55815        -          no auth   │
──────────────────────────────────────────────────────────────────│
Setup health                                                      │
    Check                    Current    Recommended               │
                                                                  │
    Runtime                                                       │
  ● PHP version              8.3.12     >= 8.2                    │
  ● Memory limit             512M       >= 512M                   │
                                                                  │
    Local behavior                                                │
  ● Admin Worker             disabled   disabled                  │
                                                                  │
    Debug (Flow Builder)                                          │
  ● Flow Builder log level   DEBUG      min WARNING               │

Testing

• Unit tests for the memory-limit parser, each health check's level classification, the Access table (installed / not-installed states), both layouts, and a regression test that OSC 8 sequences stay zero-width so columns remain aligned
• go test ./..., go vet, and gofmt clean

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