Rebrand to Dice Engage, update deployment/service names, and add Kubernetes services doc

[folkadonis]

Motivation

• Align repository branding and deployment artifacts to the new product name Dice Engage instead of Dittofeed.
• Ensure deployment manifests and service identifiers match the rebrand to avoid mismatches when deploying to Render or Docker Compose.
• Provide guidance for running the stack on Kubernetes by documenting required services and recommended topology.

Description

• Added KUBERNETES_SERVICES.md with recommended pods/services, Render mapping, deployment hints, and scaling/monetization guidance.
• Updated README.md to replace user-facing occurrences of Dittofeed with Dice Engage and adjusted related copy and image alt text.
• Updated docker-compose.lite.yaml to change ClickHouse default user to diceengage, Postgres default database to diceengage, and the internal network name to dice-engage-network-lite in place of dittofeed-network-lite.
• Updated render.yaml to rename database and service resources from dittofeed-* to dice-engage-* and set the ClickHouse credential CLICKHOUSE_USER to diceengage so Render env mappings match the new names.

Testing

• Validated the lite compose file with docker-compose -f docker-compose.lite.yaml config, which succeeded and produced a merged compose configuration.
• Performed a YAML syntax check on render.yaml with a YAML linter, which reported no syntax errors.
• No application unit tests were changed by this PR and none were required for these documentation/config updates.

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Codex Task