fix: infer CLI SSL from host protocol

[marandaneto]

💡 Motivation and Context

Fixes #25 for the bin/posthog CLI.

The CLI always passed an explicit ssl option, defaulting to true unless --no-ssl was provided. That prevented PostHog::init() from inferring ssl=false from http:// hosts, so local HTTP hosts still required --no-ssl.

💚 How did you test it?

• php -l bin/posthog
• vendor/bin/phpcs bin/posthog
• vendor/bin/phpunit --do-not-fail-on-warning --do-not-fail-on-deprecation --do-not-fail-on-phpunit-warning --do-not-fail-on-phpunit-deprecation --filter 'testInitWithHttpHostSetsSslFalse|testInitWithWhitespacePaddedHttpHostSetsSslFalse|testInitWithHttpsHostSetsSslTrue|testInitWithEnvHttpHostSetsSslFalse' test/PostHogTest.php
• Verified manually against a local HTTP server that php bin/posthog --type capture --apiKey key --distinctId id --event ev --properties '{}' --host http://127.0.0.1:<port> --debug sends POST /batch/ without --no-ssl.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Added the release label to the PR
• Added exactly one version bump label: bump-patch, bump-minor, or bump-major