Merge config updates instead of rewriting the whole row

saveConfig() serializes the entire in-memory array back over the row, using
whatever getConfig() read at the start of the request. Callers that hold that
snapshot for a while then discard edits made in between, which is why the MCP
server list kept reverting:

• background.php keeps the snapshot for the length of the request, up to
  OC_TIMEOUT seconds, then saveTokensFromResponse() writes it back. Editing
  the settings within that window lost the change.
• the status poll calls canSudo(), which writes the whole config when its
  hourly cache expires.
• noteMinVersion() fires on any API error and does the same.

updateConfig() re-reads the row and merges only the keys it was given, with
null removing one. All eleven call sites outside the settings form now use it;
the form keeps saveConfig(), since there writing every posted field is the
point.

Verified with two processes: a worker holding a stale snapshot and an admin
save. The admin's value survives and the worker's key is still written.
https://github.com/golnet1/majordomo-opencode/comm...

feat: remote MCP через mcp-proxy + type: remote

• syncMCPProxies() управляет mcp-proxy процессами на dom
• buildRemoteConfig() конвертирует local MCP в type: remote URL
• PATCH /global/config синхронизирует трансформированный конфиг
• Поля MCP Proxy IP/Port в настройках модуля
• Один порт 18765 для всех MCP серверов (named servers через mcp-proxy)
  https://github.com/golnet1/majordomo-opencode/comm...

Add Parameters section with memory limit UI in server tab

• New accordion 'Parameters' between Network/Auth and Full Access
• Checkbox to enable/disable memory limit
• Editable MemoryMax and MemoryHigh fields (shown on checkbox)
• Conditionally adds MemoryMax/MemoryHigh to systemd drop-in
• Language constants for EN (default) and RU
  https://github.com/golnet1/majordomo-opencode/comm...

Add Parameters section with memory limit UI in server tab

• New accordion 'Parameters' between Network/Auth and Full Access
• Checkbox to enable/disable memory limit
• Editable MemoryMax and MemoryHigh fields (shown on checkbox)
• Conditionally adds MemoryMax/MemoryHigh to systemd drop-in
• Language constants for EN (default) and RU
  https://github.com/golnet1/majordomo-opencode/comm...

fix: add MemoryMax/MemoryHigh limits to opencode-web systemd service
https://github.com/golnet1/majordomo-opencode/comm...

fix: only add default MCP server if OC_MCP_SERVERS key missing from config
https://github.com/golnet1/majordomo-opencode/comm...

fix: check OC_MCP_SERVERS in config instead of file existence
https://github.com/golnet1/majordomo-opencode/comm...

fix: load config before saveConfig in install() to prevent settings wipe
https://github.com/golnet1/majordomo-opencode/comm...

fix: tab value override in run() prevents saving settings on first visit
https://github.com/golnet1/majordomo-opencode/comm...

feat: add default music MCP server example on first install only
https://github.com/golnet1/majordomo-opencode/comm...