docs: add warning about mode=none disabling streaming capability (#22056)
* docs: add warning about mode=none disabling streaming Add a warning admonition to the 'Disable the Local Dashboard' section explaining that mode=none disables the entire web server on port 19999, including streaming capability. This clarifies that parent-child streaming architectures should NOT use this setting. * docs: clarify mode=none impact on streaming per Copilot review - Distinguish between inbound streaming (blocked) and outbound streaming (not inherently disabled) - Clarify bearer token protection secures dashboard/API access, not streaming connections - Reference default port 19999 for accuracy with non-default configurations - Address all 3 Copilot review suggestions from PR #22056 * Update docs/netdata-agent/securing-netdata-agents.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * Update docs/netdata-agent/securing-netdata-agents.md Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * docs: add warning about mode=none impact on streaming to web server reference * docs: simplify mode=none admonition to concise note * docs: simplify mode=none admonition to concise single-paragraph note * docs: compact mode=none admonition to reduce line span * docs: add blank lines to mode=none admonition for consistent rendering * docs: compact mode=none admonition to minimize line span * docs: fix mode=none admonition terminology and formatting Uppercase Netdata terminology (Agent, Child Agents, Parent Agents) and use 5-line admonition structure with blank lines per docs-writing-instructions. * Apply suggestions from code review Co-authored-by: Ilya Mashchenko <ilya@netdata.cloud> * Apply suggestions from code review Co-authored-by: Fotis Voutsas <fotis@netdata.cloud> * Apply suggestions from code review Co-authored-by: Fotis Voutsas <fotis@netdata.cloud> * update * update --------- Co-authored-by: nedi-app[bot] <bot@netdata.cloud> Co-authored-by: Fotis Voutsas <fotis@netdata.cloud> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Ilya Mashchenko <ilya@netdata.cloud>