docs: update Wall of Heroes with April 2026 contributions

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Summary

Updates contributor entries for recent merged work:

• gabsprogrammer: Dashboard liquid metal visual refresh (feat(polish dashboard): frontend layout and status flows #823), splash screen with full accessibility, Windows PS5.1 Unicode fix (fix(windows): resolve PS 5.1 parse errors by replacing Unicode em dashes #780), extension catalog timeout fix (fix(dashboard-api): prevent timeout when fetching extension catalog #781), health-check crash fix (fix(health-check): remove duplicate sr_load call that crashes without registry #730), backup manifest fix (fix(backup): parse .version as JSON in backup manifest generation #729)
• Arifuzzamanjoy: Bootstrap Dockerfile version pinning (fix(bootstrap): pin yq and compose versions in Dockerfile #816), Draft7Validator jsonschema compat (fix(extensions-library): use Draft7Validator for jsonschema 3.x compat #817), compatibility blocks for 25 manifests (fix(extensions-library): add compatibility blocks to 25 manifests #717), gpu_backends additions (fix: add missing gpu_backends to 8 extension manifests #675), baserow typo (fix(extensions-library): fix typo in baserow manifest tags #718)
• yasinBursali: Host-agent stats/logs endpoints (feat(host-agent): add per-container stats endpoint and extract dir_size_gb #804, feat(host-agent): add read-only service logs endpoint for all services #806), dashboard log routing with label spoofing prevention (feat(dashboard-api): route logs through read-only service endpoint #808), per-service resource metrics (feat(dashboard-api): add per-service resource metrics endpoint #810), bootstrap progress + macOS hot-swap with rollback (feat(bootstrap): add download progress tracking and macOS model hot-swap #795), CLI version/registry/compose-flags fixes (fix: read CLI version from .env, scan user-extensions, regenerate compose-flags #790), GPU assignment JSON fix (fix: generate GPU assignment JSON for single-GPU NVIDIA systems #789), compose validation (fix: add compose syntax validation before container launch in phase 11 #788), extension version bounds (fix: add dream_min version bounds to 15 extension manifests #787), privacy-shield data dir (fix: pre-create privacy-shield data directory in installer #786)
• Tony363: Rust/Axum dashboard-api prototype noted as WIP (feat(dashboard-api): rewrite from Python/FastAPI to Rust/Axum #821), pipefail hostname fix (fix(installer): pipefail-safe hostname fallback in phase 13 #820), APU name fallback (fix: unified APU name fallback in GPU detection #715)

Test plan

• Verify README renders correctly on GitHub
• Confirm no contributor was accidentally removed

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