Fix energy cost showing 0.00 in "Total Consumption" mode (fixes #284)

homeassistant_service.get_energy() was called without first configuring
the service with the HA URL and token, so it returned None for all
Home Assistant smart plugs. Added configure() call before the plug
loop, matching the pattern used in main.py and smart_plugs.py.

CHANGELOG.md

@@ -6,6 +6,7 @@ All notable changes to Bambuddy will be documented in this file.
 
 ### Fixed
 - **Filament Usage Charts Inflated by Quantity Multiplier** ([#229](https://github.com/maziggy/bambuddy/issues/229)) — Daily, weekly, and filament-type charts were multiplying `filament_used_grams` by print quantity, even though the value already represents the total for the entire job. A 26-object print using 126g was counted as 3,276g. Removed the erroneous multiplier from three aggregations in `FilamentTrends.tsx`.
+- **Energy Cost Shows 0.00 in "Total Consumption" Mode** ([#284](https://github.com/maziggy/bambuddy/issues/284)) — Statistics Quick Stats showed 0.00 energy cost when Energy Display Mode was set to "Total Consumption" with Home Assistant smart plugs. The `homeassistant_service` was not configured with HA URL/token before querying plug energy data, causing it to silently return nothing.
 
 ### Testing
 - **Mock FTPS Server & Comprehensive FTP Test Suite** — Added 67 automated test cases against a real implicit FTPS mock server, covering every known FTP failure mode from 0.1.8+:

backend/app/api/routes/archives.py

@@ -545,6 +545,11 @@ async def get_archive_stats(
         plugs_result = await db.execute(select(SmartPlug))
         plugs = list(plugs_result.scalars().all())
 
+        # Configure HA service once (needed for homeassistant-type plugs)
+        ha_url = await get_setting(db, "ha_url") or ""
+        ha_token = await get_setting(db, "ha_token") or ""
+        homeassistant_service.configure(ha_url, ha_token)
+
         total_energy_kwh = 0.0
         for plug in plugs:
             if plug.plug_type == "tasmota":