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feat: steer httpd worker off a claimed core (#1204)

Sets httpd_config_t.core_id from a new pure helper,
bb_http_core_steer_resolve() (wrapping bb_wdt_steer_core()), before
httpd_start(), so the httpd worker task never lands on a core another
component has exclusively claimed via bb_wdt_claim_core_exclusive().
This is the second failure mode in KB 350 (httpd worker starvation);
the first (idle-check polarity) was handled by the core-claim/
reconfigure work in #1192/#1197.

With nothing claimed and no explicit CONFIG_BB_HTTP_TASK_CORE_ID pin
(the default), this resolves to tskNO_AFFINITY unchanged, matching
the pre-existing HTTPD_DEFAULT_CONFIG() behavior exactly. An explicit
pin still always wins over steering, and a unicore target (esp32c3/
esp32s2) never steers, since bb_wdt_steer_core() short-circuits when
num_cores < 2.

bb_http_server PRIV_REQUIRES bb_wdt directly now; this was already a
transitive dependency via bb_log -> bb_task -> bb_wdt, so no new
component cycle.

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