feat: add /api/v1/health public endpoint

- Add public health routes at /api/v1/health, /api/v1/health/detailed, /api/v1/health/consistency
- Make health functions and response types public
- Public routes bypass auth middleware (unlike protected /api/v1/* routes)

src/api/health.rs

@@ -52,7 +52,7 @@ pub fn get_uptime_ms() -> u64 {
 }
 
 #[derive(Debug, Serialize)]
-struct HealthResponse {
+pub struct HealthResponse {
     ip: String,
     port: u16,
     status: String,
@@ -68,7 +68,7 @@ struct HealthResponse {
 }
 
 #[derive(Debug, Serialize)]
-struct DetailedHealthResponse {
+pub struct DetailedHealthResponse {
     ip: String,
     port: u16,
     status: String,
@@ -189,7 +189,7 @@ struct ServiceStatus {
     error: Option<String>,
 }
 
-async fn health(State(state): State<AppState>) -> Json<HealthResponse> {
+pub async fn health(State(state): State<AppState>) -> Json<HealthResponse> {
     let postgres = check_postgres().await;
     let redis = check_redis().await;
     let qdrant = check_qdrant().await;
@@ -222,7 +222,7 @@ async fn health(State(state): State<AppState>) -> Json<HealthResponse> {
     })
 }
 
-async fn health_detailed(State(state): State<AppState>) -> Json<DetailedHealthResponse> {
+pub async fn health_detailed(State(state): State<AppState>) -> Json<DetailedHealthResponse> {
     let postgres = check_postgres().await;
     let redis = check_redis().await;
     let qdrant = check_qdrant().await;
@@ -420,7 +420,7 @@ async fn health_detailed(State(state): State<AppState>) -> Json<DetailedHealthRe
     })
 }
 
-async fn health_consistency(
+pub async fn health_consistency(
     State(state): State<AppState>,
 ) -> Result<Json<crate::core::health_agent::ConsistencyReport>, (StatusCode, String)> {
     let report = crate::core::health_agent::run_consistency_checks(&state.db).await;