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refactor(webui): convert /api routes to streaming bb_http_resp_json_obj_* (B1-234) (#425)

* refactor(webui): convert /api routes to streaming bb_http_resp_json_obj_* (B1-234)

- replace bb_json_obj_new() + build_*_json() + bb_http_resp_send_json() with
  bb_http_resp_json_obj_begin/set_*/end in all GET handlers: stats, pool,
  power, fan, diag/asic, settings
- convert emit_pool_stats_json call to inline streaming stats array in pool_handler
- convert all bb_http_resp_send_err() to bb_http_resp_set_status + streamed
  {"error":"..."} objects across: prov save cb, pool PUT/switch/DELETE,
  fan POST, settings GET/POST/PATCH
- convert 204 no-content bb_http_resp_send(req,"",0) paths to bb_http_resp_send_chunk(req,NULL,0)
- routes_json.c helpers (build_stats_json, build_pool_json, etc.) preserved for host test coverage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* fix(webui): heap-alloc pool_snapshot to avoid httpd stack overflow

pool_handler had pool_snapshot_t (~1991 B) + stats_arr[8] (~912 B) on
stack. The new bb_http_json_obj_stream_t (~1040 B) pushed the frame past
the 4 KiB httpd worker stack, corrupting the next frame under any /api/pool
poll. Move both snapshots to heap and free before return.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* chore(deps): bump breadboard to v0.39.0

Streaming-only response API pivot (B1-234). Includes deletion of
bb_ota_pull_set_firmware_board; bb_update_check_set_firmware_board
already sets the board name and bb_ota_pull reads from update_check's
status snapshot.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* fix(sdkconfig): restore BB defaults for LWIP_RESERVE + EVENT_ROUTES_MAX_CLIENTS

Bitaxe-650 dashboard crash under load (TA-385): lowering BB_HTTP_LWIP_RESERVE
to 1 starved stratum + transient outbound under concurrent /api/* fan-out;
raising BB_EVENT_ROUTES_MAX_CLIENTS to 4 reserved ~27 KB heap on ~100 KB-free
hardware. Restore BB defaults (3 / 2) so httpd has headroom... (continued)

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