Initial project: ESP32-S3 e-ink photo frame with web UI

ESP32-S3 firmware (PlatformIO) that fetches JPEGs from a photo server,
decodes on-device with PSRAM, Floyd-Steinberg dithers to the Spectra 6
6-color palette, and displays on a 7.3" GDEP073E01 e-paper panel.
Deep sleeps 1 hour between updates.

Photo server (Python/Flask) with web UI for photo management, Traefik
routing at photos.haunt.house with Google OAuth, and Home Assistant
REST sensor integration.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

homeassistant/configuration.yaml.example

@@ -0,0 +1,36 @@
+# Home Assistant configuration for the E-Ink Photo Frame
+# Add this to your HA configuration.yaml
+
+rest:
+  - resource: "http://eink-photo-server:8473/api/status"
+    scan_interval: 300  # check every 5 minutes
+    sensor:
+      - name: "Photo Frame"
+        value_template: "{{ value_json.state }}"
+        json_attributes:
+          - last_update
+          - current_photo
+          - frame_ip
+          - total_photos
+          - total_updates
+
+template:
+  - sensor:
+      - name: "Photo Frame Current Photo"
+        state: "{{ state_attr('sensor.photo_frame', 'current_photo') or 'unknown' }}"
+        icon: mdi:image
+
+      - name: "Photo Frame Last Update"
+        state: >
+          {% set ts = state_attr('sensor.photo_frame', 'last_update') %}
+          {% if ts %}
+            {{ as_timestamp(ts) | timestamp_custom('%b %d %I:%M %p') }}
+          {% else %}
+            Never
+          {% endif %}
+        icon: mdi:clock-outline
+
+      - name: "Photo Frame Library Size"
+        state: "{{ state_attr('sensor.photo_frame', 'total_photos') | int(0) }}"
+        unit_of_measurement: "photos"
+        icon: mdi:image-multiple