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feat(bb_http): generic route-extender registry (migrate /api/info + /api/health onto it) (#357)

* feat(bb_http): generic route-extender registry + schema assembly

Add a portable, route-keyed extender registry to bb_http so any route
(not just /api/info and /api/health) can accept runtime extender callbacks
and JSON-Schema properties fragments.

- new components/bb_http/src/bb_http_extender.c — portable C, compiles on
  both espidf and host; no platform-specific code
- new components/bb_http/include/bb_http_extender.h — public API:
  bb_http_register_route_extender, bb_http_route_run_extenders,
  bb_http_route_assemble_schema, bb_http_extender_freeze
- new components/bb_http/include/bb_http_extender_test.h — test hooks
  under BB_HTTP_TESTING: reset, freeze, get_assembled_schema per route_id
- route keying: fixed table of BB_HTTP_EXTENDER_MAX_ROUTES=8 slots,
  strcmp; BB_HTTP_EXTENDER_MAX_PER_ROUTE=8 per route
- freeze semantics: bb_http_extender_freeze() gates all subsequent
  registration attempts with BB_ERR_INVALID_STATE
- host build: bb_http entry in native_scaffold.py gains the new source;
  BB_HTTP_TESTING added to platformio.ini build_flags

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* refactor(bb_info): migrate /api/info + /api/health onto bb_http route extenders

Migrate bb_info's hardcoded per-route extender tables and schema assembly
onto the new generic bb_http_extender facility.

- bb_info_register_extender[_ex] and bb_health_register_extender[_ex] are
  now thin wrappers over bb_http_register_route_extender("info"/"health")
- assemble_schema local function and s_extenders/s_health_extenders tables
  removed from both espidf and host implementations
- bb_info_init() calls bb_http_route_assemble_schema("info"/...,"health"/...)
  and publishes results into s_info_responses[0].schema and
  s_health_responses[0].schema (load-bearing OpenAPI publish preserved)
- bb_http_extender_freeze() called alongside the capability freeze a... (continued)

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