feat: add services page and API endpoints for service cost breakdown

- Implemented new API endpoints for fetching global services and service tenants details.
- Created a new services.html page with a sidebar for navigation and a chart for service costs.
- Updated frontend JavaScript to handle service data loading and rendering.
- Enhanced the dashboard with provider filtering options for AWS and Azure.
- Added a segmented toggle for selecting the date range for service costs.
- Improved styling for the sidebar and data tables.
- Refactored common utility functions for better reusability across pages.

api/main.py

@@ -52,6 +52,11 @@ def tenant_page(provider: str, name: str):
     return _read_page("tenant.html")
 
 
+@app.get("/services", response_class=HTMLResponse)
+def services_page():
+    return _read_page("services.html")
+
+
 @app.get("/health")
 def health():
     try:
@@ -74,11 +79,43 @@ def api_overview(months: int = Query(12, ge=1, le=24)):
         conn.close()
 
 
+VALID_RANGES = (1, 7, 30, 365)
+
+
+def _validate_provider_filter(provider: str | None) -> None:
+    if provider is not None and provider not in PROVIDERS:
+        raise HTTPException(status_code=404, detail=f"Provider inconnu : {provider}")
+
+
+@app.get("/api/services")
+def api_services(range: int = Query(30, alias="range"), provider: str | None = Query(None)):
+    if range not in VALID_RANGES:
+        raise HTTPException(status_code=400, detail="range doit être 1, 7, 30 ou 365")
+    _validate_provider_filter(provider)
+    conn = queries.get_connection()
+    try:
+        return queries.global_services(conn, range_days=range, provider=provider)
+    finally:
+        conn.close()
+
+
+@app.get("/api/services/{service_name}/tenants")
+def api_service_tenants(service_name: str, range: int = Query(30, alias="range"), provider: str | None = Query(None)):
+    if range not in VALID_RANGES:
+        raise HTTPException(status_code=400, detail="range doit être 1, 7, 30 ou 365")
+    _validate_provider_filter(provider)
+    conn = queries.get_connection()
+    try:
+        return queries.service_tenants_detail(conn, service_name, range_days=range, provider=provider)
+    finally:
+        conn.close()
+
+
 @app.get("/api/tenant/{provider}/{name}")
 def api_tenant_detail(provider: str, name: str, range: int = Query(30, alias="range")):
     _require_provider(provider)
-    if range not in (7, 30, 365):
-        raise HTTPException(status_code=400, detail="range doit être 7, 30 ou 365")
+    if range not in VALID_RANGES:
+        raise HTTPException(status_code=400, detail="range doit être 1, 7, 30 ou 365")
     conn = queries.get_connection()
     try:
         return queries.tenant_detail(conn, provider, name, range_days=range)