feat: default analytics to the dedicated ingest service

[tomasstark]

This PR points the SDK's analytics relay at the dedicated ingest service (https://ingest-connect.supertab.co) by default, instead of the API host. Only the analytics host changes — the /ingest/events path and payload are the same, and token acquisition / JWKS / verification still use the API base URL.

Context

Ports the TypeScript SDK 2.2.2 change (phase 2 of splitting analytics ingest onto its own service): any handler running analyticsEnabled: true shifts its ingest traffic onto the standalone service on upgrade, draining ingest load off the main API.

Key Changes

• New static $analyticsBaseUrl defaulting to the ingest service, wired into the default HttpAnalyticsTransport in place of the API base URL.
• New analyticsBaseUrl constructor option plus static setAnalyticsBaseUrl() / getAnalyticsBaseUrl(), mirroring baseUrl / setBaseUrl(). Precedence matches TS: per-instance option > static setter > ingest default; the per-instance option does not mutate the global.
• Test suite mirroring the TS analytics base URL resolution cases: default host, both overrides, precedence, and independence from setBaseUrl().
• README: analytics section and config table describe the new host and options.

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Ref: connect-sdk-typescript#41

[Copilot]

Pull request overview

Updates the PHP SDK’s analytics relay configuration so analytics events default to the dedicated ingest service (https://ingest-connect.supertab.co) rather than the API host, while keeping token acquisition/JWKS/verification on the API base URL.

Changes:

• Add a separate static SupertabConnect::$analyticsBaseUrl defaulting to the ingest service, plus setAnalyticsBaseUrl() / getAnalyticsBaseUrl().
• Add a per-instance analyticsBaseUrl constructor option that overrides the static value without mutating global configuration.
• Add tests for analytics base URL resolution and update README analytics docs/examples accordingly.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/SupertabConnect.php	Introduces a dedicated analytics base URL with static getters/setters and constructor override, wiring it into the default HTTP analytics transport.
tests/SupertabConnectAnalyticsBaseUrlTest.php	Adds coverage for default/override/precedence behavior of the analytics base URL.
README.md	Documents the new analytics host behavior, new configuration option, and new static APIs.

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