<!-- Describe your changes in detail -->
Added health check for Decision engine service
To implement this **search_filter** feature, you'll need to modify these architectural layers:


**1. API Request/Response Models**
   - `crates/api_models/src/health_check.rs`

**2. Core Business Logic**
   - `crates/router/src/core/health_check.rs`

**3. Other**
   - `crates/router/src/routes/health.rs`
   - `crates/storage_impl/src/errors.rs`

**Code Patterns Applied:**
- Implement new functions (2 changes)
- Extend existing types with new fields (3 changes)
- Add conditional logic for feature flags or filtering (1 changes)

**Detailed Identifier Changes:**


Commit 5ab769d1:
Files to modify:


**crates/api_models/src/health_check.rs**
  Modify existing code

**crates/router/src/core/health_check.rs**
  Modify existing code

**crates/router/src/routes/health.rs**
  Modify existing code

**crates/storage_impl/src/errors.rs**
  Modify existing code
{"pr_number": 8243, "pr_title": "feat(health): Health check for Decision engine", "merged_at": "2025-06-09T07:59:11Z", "intent": {"feature_type": "search_filter", "action": "add_feature", "entities": []}, "hierarchy": {"api_models": ["crates/api_models/src/health_check.rs"], "core_business": ["crates/router/src/core/health_check.rs"], "other": ["crates/router/src/routes/health.rs", "crates/storage_impl/src/errors.rs"]}, "change_types": {"functions_added": 2, "enums_added": 1, "fields_added": 3, "conditionals_added": 1}, "has_identifier_data": true, "commits_matched": 1, "match_method": "pr_number"}