docs(cdc): document Debezium push ingest (from: cdc:, no Kafka)

[claudespice]

Summary

Documents the new push-based Debezium CDC ingest path shipped in spiceai/spiceai#11955: any Debezium source plugin (Debezium Server / Embedded Engine) can stream change events directly into a Spice-accelerated dataset over HTTP — from: cdc:<name> + POST /v1/datasets/{name}/cdc, JSON or Avro — with no Kafka bus. The existing Kafka debezium: connector path is unchanged.

New content (vNext / website/docs only — this feature is not in any released version):

• New page features/cdc/debezium-ingest.md — architecture, spicepod config, HTTP API (content types, JSON/Avro body shapes, response + full status-code table), Debezium Server sink example, native-vs-push comparison, feature availability.
• Adds the push-ingest path to the Supported Data Connectors list in features/cdc/index.md.

Verified against source (origin/trunk)

• Route POST /v1/datasets/{name}/cdc and status mapping (200/400/403/404/501/503/504) from crates/runtime/src/http/v1/cdc.rs and routes.rs.
• Params are declared ParameterSpec::component under prefix() = "cdc", so the user-facing keys are cdc_schema_registry_url / cdc_avro_schema (the runtime ignores the unprefixed form with a warning — runtime-parameters/src/lib.rs). The source PR's own draft doc used the bare keys; this page uses the prefixed form.
• debezium is in the spiced default feature set (bin/spiced/Cargo.toml) and the released images build with defaults (--features release,models, no --no-default-features), so "included in default builds" is accurate — no Enterprise callout needed. A build without the feature returns 501.

Source PRs

• feat(cdc): Debezium plugin push ingest to Spice without Kafka spiceai#11955 — feat(cdc): Debezium plugin push ingest to Spice without Kafka

Test plan

• cd website && npm run build passes (exit 0, no broken-link/undefined-tag errors)
• New links resolve: ./index.md, ./debezium.md, ../../api/auth/index.md, ../../components/data-accelerators/arrow/index.md
• vNext-only (addition — feature absent from released versions), no versioned-docs propagation
• Files updated: 2

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🔍 Pull with Spice Failed

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Please address these issues and update your pull request.

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🔍 Pull with Spice Failed

Passing checks:

• ✅ Title meets minimum length requirement (10 characters)
• ✅ Has at least one of the required labels: area/blog, area/docs, area/cookbook, dependencies
• ✅ No banned labels detected

Failed checks:

• ❌ At least one assignee is required for this pull request.

Please address these issues and update your pull request.

[github-actions]

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