fix: bound HTTP query parameters

[ShiroKSH]

Summary

• Limit parsed query parameters to ECS_HTTP_QUERY_PARAM_COUNT_MAX.
• Preserve the final accepted parameter when additional query fields are present.
• Add HTTP regression coverage and regenerate the distribution source.

Root cause

The request parser recorded every query parameter although ecs_http_request_t::params is a fixed 32-entry array. Decoding a request with a 33rd field wrote past that array.

Testing

• bake run test/addons -- Http.query_params_max
• bake run test/addons --cfg sanitize -- Http.query_params_max
• bake run test/addons -- Http
• cmake --build /tmp/flecs-cmake-strict -j 4
• clang -std=gnu99 -fsyntax-only -Werror -Wall -Wextra -Wno-unused-parameter -Wno-missing-field-initializers distr/flecs.c

[SanderMertens]

LGTM!