v0.35.1: performance, AGPL licensing and documentation overhaul

- Web Server reads static files inline; proxy middleware chain flattened
- About window with license summary and project links; AGPL-3.0-or-later
- Rewritten documentation: feature list, screenshots, performance guide
- Fix false spikes in per-Vhost request-rate charts

AGENTS.md

@@ -1,13 +1,13 @@
 # RustProxy source and documentation maintenance
 
-Current source version: **0.35.0**. The Cargo package and binary are named `rust-proxy`.
+Current source version: **0.35.1**. The Cargo package and binary are named `rust-proxy`.
 
-Before editing, read [README.md](README.md), [ROADMAP.md](ROADMAP.md), the relevant [documentation guide](docs/README.md) and the actual code and tests. Historical release experiments are not current specifications. Use the bundled `src/admin/openapi.json` for API routes and payloads; the source implementation is authoritative for runtime behavior.
+Before editing, read [README.md](README.md), the relevant [documentation guide](docs/README.md) and the actual code and tests. Historical release experiments are not current specifications. Use the bundled `src/admin/openapi.json` for API routes and payloads; the source implementation is authoritative for runtime behavior.
 
 ## Keep documentation in sync
 
 - Write product documentation in English. Prefer focused instructions: purpose, configuration, defaults, restrictions, verification and common failures. Keep change history technical but user/operator-facing, not a series of profiling notes.
-- Update the guide, [docs index](docs/README.md), [changelog](CHANGELOG.md), embedded Reader registry (`src/admin/documentation/documents.rs`) and API schema/tests together when functionality changes.
+- Update the guide, [feature list](docs/FEATURES.md), [docs index](docs/README.md), [changelog](CHANGELOG.md), embedded Reader registry (`src/admin/documentation/documents.rs`) and API schema/tests together when functionality changes.
 - Reader Markdown is compiled into the binary using `include_str!`. Renaming/deleting a guide without updating the registry breaks compilation. Avoid broken relative links.
 - Keep per-component optional defaults accurate (for example COLD off, Prometheus off, backend `tls_verify` off unless explicitly set, and optional Web Server `sendfile` off). Mark source-only or untested changes accordingly.
 - Maintain existing `langs/*.json` packs; `build.rs` discovers available locales. Do not add credentials, databases, real certificates, environment secrets or build artifacts to source archives.