fix(localmode): include DynamoDB for function logs

[swkeever]

Summary

• Update the embedded local-mode Docker Compose template to include DynamoDB Local.
• Pass the function invocation and log-event table env vars expected by the updated hosting server.
• Keep the CLI-owned compose asset free of server-owned first-party local secrets.

Architecture

• volcano start now brings up DynamoDB Local alongside the existing local-mode services.
• The hosting server receives DYNAMODB_ENDPOINT, FUNCTION_INVOCATIONS_TABLE_NAME, and LOG_EVENTS_HOT_PATH_TABLE_NAME so local mode uses the same DynamoDB-backed function logging hot path as the hosting PR.
• The DynamoDB data volume is declared in the embedded compose template so local log/invocation tables survive container restarts.

Related PRs

• Hosting API/backend: https://github.com/Kong/volcano-hosting/pull/370
• Web UI: https://github.com/Kong/volcano-web/pull/98

Validation

• GitHub Actions green on this PR, including check / check, check / localmode-e2e, and CodeQL.
• docker compose -f internal/localmode/assets/docker-compose.template.yml config --quiet
• go test ./internal/localmode
• go test ./...

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