dangernoodle-io / TaipanMiner / 26993797424

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feat(knot): compile-gate knot behind KNOT_ENABLED, default off on headless boards (#503)

~8.3 KB .bss peer table (g_peer_table[32]) is dead weight on UI-off boards;
gate the component sources + call sites + the /api/knot route and its reserve
behind CONFIG_KNOT_ENABLED so it is removed from the binary when
WEBUI_MINING_UI=n (e.g. esp32-s2-mini). knot is informational-only (feeds
/api/knot for the dashboard) with no mining/stratum/wifi/ota impact.

- add components/knot/Kconfig: CONFIG_KNOT_ENABLED bool, default WEBUI_MINING_UI
- CMakeLists: gate SRCS behind CONFIG_KNOT_ENABLED; REQUIRES always declared
  unconditionally so the dependency graph is stable regardless of the gate
  (conditional REQUIRES causes include-path resolution failure on configure)
- main.c: gate #include, knot_en local, knot_init/knot_set_self block
- routes.c: gate #include, knot_handler + ctx types, s_knot_route, s_knot_route
  entry in s_mining_routes (sizeof-derived reserve count auto-adjusts), health
  extender knot_is_running(), settings GET knot_en assignment, and the full
  knot_en PATCH transition block

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