fix: keep internal navigation under test base path

fix: resolve 404 errors by adding BASE_PATH for subfolder deployment

ci: fix secret names to match FTP_SERVER/FTP_USERNAME/FTP_PASSWORD

ci: fix FTP URL encoding for filenames with spaces, add login test

ci: fix nc install, switch to curl for FTP deploy

ci: switch to new FTP host 77.222.40.65 with port connectivity test

ci: force IPv4 for deploy webhook to resolve unreachable IPv6

ci: fix domain to polar-media.ru in deploy workflow and astro config

ci: add endpoint ping healthcheck and auto-selection

ci: add chunked upload support for large site bundles

ci: add deploy.php and configure webhook deployment

ci: switch deploy pipeline to sftp over ssh port 22

ci: test connectivity to polarmedia.ru 62.122.170.171

ci: add ping, traceroute, nslookup, and curl tests

ci: fix target variable definition in diagnostics

ci: add comparative network diagnostics to test outbound vs inbound blocking

ci: fix pip install on ubuntu 24 runner

ci: add full sftp handshake and auth diagnostics

ci: add detailed ftp connection diagnostics

ci: inspect runner public ip and sanitize host