fix(#466,#467,#468): fix Kubernetes cluster creation

[poyrazK]

Summary

Fix three blocking issues that prevent Kubernetes cluster creation:

• Kubernetes cluster creation fails - cluster worker missing TenantID in context #466: Cluster worker sets only UserID in context, but VPC repo queries require tenant_id. Added TenantID to context and cluster_repo queries.
• Kubernetes cluster creation fails - Dockerfile missing K8s templates #467: Dockerfile was missing K8s templates directory. Added COPY for templates.
• Kubernetes cluster creation fails - CLOUD_API_URL env var not documented and not in docker-compose.yml #468: CLOUD_API_URL env var was not set in docker-compose.yml. Added it with default for local dev.

Changes

• internal/workers/cluster_worker.go: Set TenantID in context alongside UserID
• internal/repositories/postgres/cluster_repo.go: Added tenant_id to INSERT, GetByID, ListByUserID, Update, Delete, ListAll, and scanCluster
• internal/repositories/postgres/migrations/100_add_clusters_tenant_id.up.sql: Migration to add tenant_id column
• Dockerfile: Copy k8s templates to production image
• docker-compose.yml: Add CLOUD_API_URL env var
• .env.example: Document CLOUD_API_URL

Test Plan

• Code compiles
• Run cluster-related unit tests
• Test kubernetes create with all three fixes in place

Related Issues

Fixes #466, #467, #468

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 05f55742-11be-471a-863b-8925b3506641

📥 Commits

Reviewing files that changed from the base of the PR and between 5faabcc and 91d38ed.

📒 Files selected for processing (7)

• .env.example
• Dockerfile
• docker-compose.yml
• internal/repositories/postgres/cluster_repo.go
• internal/repositories/postgres/migrations/100_add_clusters_tenant_id.down.sql
• internal/repositories/postgres/migrations/100_add_clusters_tenant_id.up.sql
• internal/workers/cluster_worker.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/k8s-cluster-creation-466-467-468

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