dangernoodle-io / breadboard / 27106995033

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fix(bb_http): detect duplicate (method,path) routes — warn+drop, BB_HTTP_ROUTE_DUP_STRICT to hard-fail (#362)

- scan existing dispatch entries on each bb_api_dispatch_add call;
  duplicate (method, path) is warned via bb_log_w and dropped
  (first registration wins); returns BB_ERR_INVALID_STATE
- callers (espidf + host bb_http_register_route) already ignore non-BB_OK
  from dispatch add and return BB_OK — existing call-sites unaffected
- new Kconfig BB_HTTP_ROUTE_DUP_STRICT (default n): escalates duplicate
  to assert, matching BB_HTTP_ROUTE_REGISTRY_STRICT pattern, for ci/smoke
- dup scan uses same case-sensitive exact-match semantics as bb_api_dispatch_lookup
- null path entries skipped in scan (mirrors lookup null guard)
- fix overflow + watermark tests to use distinct paths per entry so dup
  detection does not falsely drop fill entries
- add three new tests: dup dropped + first handler wins, different method
  same path not a dup, null-path entries not false-positive

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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