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feat(bb_http): serve /api/* via wildcard dispatch; constant max_uri_handlers (#354)

* feat(bb_http): pure /api dispatch table + lookup (hit/405/404) + host tests

- add bb_http_api_dispatch.{h,c}: static 64-entry table, exact path match,
  query-string stripping, HIT/METHOD_MISMATCH/MISS results, no heap, no esp
- wire into components/bb_http/CMakeLists.txt SRCS and native_scaffold.py
- add test/test_host/test_api_dispatch.c (13 cases: hit, miss, 405, method
  discrimination, query strip, exact-not-prefix, overflow, reset, null guards)
- bb_http.h is host-includable; included directly (no forward-decls needed)

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

* feat(bb_http): serve /api/* via wildcard dispatch; constant max_uri_handlers

- register GET/POST/PUT/PATCH/DELETE /api/* wildcards at server start (before
  asset GET /*); all dispatch through api_dispatch_handler via bb_api_dispatch
- bb_http_register_route: /api/ paths feed bb_api_dispatch_add (no httpd slot
  consumed); non-/api paths keep existing httpd_register_uri_handler path
- max_uri_handlers replaced by single constant knob BB_HTTP_MAX_URI_HANDLERS
  (default 12); removes _MIN/_OVERRIDE logic
- bb_http_reserve_routes: vestigial no-op on espidf (ABI kept; body cleared);
  host backend retains counter for existing test compat
- bb_http_api_dispatch: high-watermark bb_log_w fires once at count >= CAP-8;
  reset by bb_api_dispatch_reset(); s_warned guard added
- Kconfig: add BB_HTTP_MAX_URI_HANDLERS + BB_HTTP_API_DISPATCH_CAP; remove
  BB_HTTP_MAX_URI_HANDLERS_MIN and BB_HTTP_MAX_URI_HANDLERS_OVERRIDE
- host backend: /api/ routes feed dispatch table (mirrors espidf split)
- watermark test added; 1261 tests pass, 100% coverage

note: BB_HTTP_MAX_URI_HANDLERS_MIN/_OVERRIDE removed; TM sdkconfig references
are transient non-fatal unknown-symbol until TM is updated in step 3.

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

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Co-authored-by: Claude Sonnet 4.6 <... (continued)

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