docs: update documentation and project structure

- Update AGENTS.md, README.md, and docs/* with revisions
- Refactor lib/acme.py and lib/state.py
- Add tests for acme module
- Remove install.sh and restart-services.sh (moved to scripts/)
- Normalize vendor files (acme.sh, htm.js)

lib/state.py

@@ -818,48 +818,10 @@ def _collect_acme() -> dict[str, Any]:
     """
     email = _get_acme_email()
 
-    certs: list[dict[str, Any]] = []
     try:
-        from lib.acme import (
-            _days_until,
-            _has_auto_renew,
-            _parse_list_output,
-            _run_acme,
-        )
+        from lib.acme import list_certs
 
-        raw = _run_acme(["--list"])
-
-        entries = _parse_list_output(raw)
-        acme_home_env = os.environ.get("ACME_HOME", str(PROJECT_DIR / "data" / "acme"))
-        acme_home = Path(acme_home_env)
-        for entry in entries:
-            main = entry.get("main_domain", "")
-            if not main:
-                continue
-            san_domains = [
-                d.strip()
-                for d in entry.get("san_domains", "").split(",")
-                if d.strip() and d.strip().lower() != "no"
-            ]
-            cert_dir = acme_home / main
-            days = _days_until(entry.get("renew", ""))
-            certs.append(
-                {
-                    "domain": main,
-                    "issuer": entry.get("ca", ""),
-                    "expiry": entry.get("renew", ""),
-                    "days_remaining": days,
-                    "expired": days is not None and days <= 0,
-                    "cert_path": str(cert_dir / "fullchain.cer"),
-                    "key_path": str(cert_dir / f"{main}.key"),
-                    "ca_path": str(cert_dir / "ca.cer"),
-                    "issued_at": entry.get("created", ""),
-                    "expires_at": entry.get("renew", ""),
-                    "days_until_expiry": days,
-                    "auto_renew": _has_auto_renew(main),
-                    "san_domains": san_domains,
-                }
-            )
+        certs = list_certs()
     except Exception:
         logger.warning(
             "ACME state collection failed, returning empty cert list",