feat(redis): add Cluster, Sentinel, and TLS/SSL support

[gafda]

This pull request introduces comprehensive improvements to Redis configuration support and developer tooling. The main changes add support for Redis Cluster and Sentinel deployment modes (with optional TLS/SSL), provide detailed environment variable documentation and examples, and supply Docker Compose files for local integration testing of Redis Cluster setups (both with and without TLS). Additionally, a new .editorconfig is added to standardize code formatting across the project.

Redis configuration enhancements:

• Updated docs/CONFIGURATION.md to document support for three Redis deployment modes: standalone, cluster, and sentinel, including detailed environment variable descriptions and TLS/SSL options. Example configurations for managed Redis services (GCP Memorystore, AWS ElastiCache) are provided.
• Expanded .env.example with new variables for REDIS_MODE, cluster nodes, sentinel nodes, key prefix, and TLS/SSL configuration, plus explanatory comments for each. [1] [2]

Developer tooling and integration testing:

• Added docker-compose.redis-cluster.yml for spinning up a 6-node Redis Cluster locally, enabling integration testing for cluster mode.
• Added docker-compose.redis-cluster-tls.yml for spinning up a 6-node Redis Cluster with TLS enabled, mimicking production managed Redis setups and supporting local testing of TLS connections.

Formatting and code style:

• Introduced a project-wide .editorconfig file to enforce consistent code formatting rules across multiple languages and file types.

Kubernetes execution configuration:

• Added new Kubernetes execution mode variables and documentation to .env.example for agent and nsenter modes, including sidecar image selection and GKE Sandbox options.

[gafda]

@aron-muon : Third PR from original PR #33

[Copilot]

Pull request overview

Adds first-class support for Redis Cluster and Sentinel (with optional TLS), introduces a Redis key-prefix mechanism applied across services, and expands developer tooling/docs for local cluster testing and deployment configuration.

Changes:

• Implement Redis multi-mode configuration (standalone/cluster/sentinel) with TLS helpers, validators, and a unified async RedisPool.
• Update services to use the shared RedisPool and apply a configurable key prefix; ensure Redis pipelines are cluster-compatible (transaction=False).
• Add extensive docs/examples, Helm chart values/templates, and docker-compose + cert tooling for local Redis Cluster (TLS and non-TLS) integration testing.

Reviewed changes

Copilot reviewed 30 out of 31 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/config/redis.py	Introduces RedisConfig with mode (standalone/cluster/sentinel), TLS options, key prefix, and sanitizing validators.
src/config/__init__.py	Plumbs new Redis/env settings through Settings, adds validators, and adds service_version override.
src/core/pool.py	Implements RedisPool supporting standalone/cluster/sentinel + TLS, key prefixing, and updated pool stats.
src/utils/config_validator.py	Validates Redis connectivity per mode (cluster/sentinel/standalone) and forwards TLS kwargs.
src/utils/logging.py	Logs effective version using runtime SERVICE_VERSION override when present.
src/main.py	Uses effective_version consistently for startup logs, FastAPI version, and health endpoint.
src/services/session.py	Applies key prefix via redis_pool.make_key() and uses non-transactional pipelines for cluster compatibility.
src/services/state.py	Applies key prefix via redis_pool.make_key() and uses non-transactional pipelines for cluster compatibility.
src/services/api_key_manager.py	Applies key prefix to API key storage keys and uses non-transactional pipelines for cluster compatibility.
src/services/detailed_metrics.py	Applies key prefix to detailed metrics keys and uses non-transactional pipelines for cluster compatibility.
src/services/metrics.py	Applies key prefix to persisted metrics keys.
src/services/health.py	Uses prefixed Redis key for read/write health checks.
src/services/file.py	Switches to RedisPool client and applies key prefix to file metadata keys.
tests/unit/test_settings_validators.py	Adds tests for empty-string-to-None sanitization for Redis passwords and node lists.
tests/unit/test_session_service.py	Fixes Redis pipeline mocking to reflect redis.asyncio pipeline behavior (sync method).
tests/unit/test_core_pool.py	Updates pool initialization behavior expectations and adds cluster kwargs compatibility test.
tests/unit/test_cluster_pipeline_compat.py	Adds regression tests enforcing transaction=False pipelines across services for Redis Cluster.
tests/integration/test_redis_cluster.py	Adds optional integration tests against a local 6-node Redis Cluster.
tests/integration/test_redis_cluster_tls.py	Adds optional integration tests against a local 6-node TLS Redis Cluster and production-like TLS config.
tests/tls-certs/generate.sh	Adds cert generation script for local TLS cluster testing.
tests/tls-certs/cleanup.sh	Adds cleanup script for generated TLS artifacts.
tests/tls-certs/.gitignore	Ignores generated TLS cert/key artifacts.
docker-compose.redis-cluster.yml	Adds local 6-node Redis Cluster compose for integration testing.
docker-compose.redis-cluster-tls.yml	Adds local 6-node TLS Redis Cluster compose for integration testing.
docs/CONFIGURATION.md	Documents Redis modes, TLS options, key prefixing, and adds expanded Kubernetes execution config docs.
.env.example	Adds Redis mode/cluster/sentinel/TLS/key-prefix env vars plus Kubernetes execution mode variables.
.editorconfig	Adds project-wide formatting rules.
.gitignore	Ignores .pdm-python.
helm-deployments/kubecoderun/values.yaml	Adds Redis mode/keyPrefix/cluster/sentinel/TLS values plus Kubernetes execution mode and GKE Sandbox values.
helm-deployments/kubecoderun/templates/configmap.yaml	Renders new Redis and execution-mode env vars into the ConfigMap.
helm-deployments/kubecoderun/templates/secret.yaml	Adds optional REDIS_PASSWORD rendering alongside REDIS_URL.

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[gafda]

@aron-muon, I've fixed all Copilot's complaints.