Rename on_this_day to memory_date with exclude-same-year behavior

Renamed the date filter parameter and changed default behavior to match
Google Photos memories - now excludes assets from the same year as the
reference date, returning only photos from previous years on that day.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

@@ -151,7 +151,7 @@ data:
   asset_type: "all"            # Options: "all", "photo", "video"
   min_date: "2024-01-01"       # Optional: assets created on or after this date
   max_date: "2024-12-31"       # Optional: assets created on or before this date
-  on_this_day: "2024-02-14"    # Optional: filter by month and day (memories)
+  memory_date: "2024-02-14"    # Optional: memories filter (excludes same year)
   city: "Paris"                # Optional: filter by city name
   state: "California"          # Optional: filter by state/region
   country: "France"            # Optional: filter by country
@@ -177,7 +177,7 @@ data:
   - `"video"`: Return only videos
 - `min_date` (optional): Filter assets created on or after this date. Use ISO 8601 format (e.g., `"2024-01-01"` or `"2024-01-01T10:30:00"`)
 - `max_date` (optional): Filter assets created on or before this date. Use ISO 8601 format (e.g., `"2024-12-31"` or `"2024-12-31T23:59:59"`)
-- `on_this_day` (optional): Filter assets by matching month and day (memories/anniversary filter). Provide a date in ISO 8601 format (e.g., `"2024-02-14"`) to get all assets taken on February 14th of any year
+- `memory_date` (optional): Filter assets by matching month and day, excluding the same year (memories filter like Google Photos). Provide a date in ISO 8601 format (e.g., `"2024-02-14"`) to get all assets taken on February 14th from previous years
 - `city` (optional): Filter assets by city name (case-insensitive substring match). Based on reverse geocoded location from asset GPS data
 - `state` (optional): Filter assets by state/region name (case-insensitive substring match). Based on reverse geocoded location from asset GPS data
 - `country` (optional): Filter assets by country name (case-insensitive substring match). Based on reverse geocoded location from asset GPS data
@@ -272,7 +272,7 @@ target:
   entity_id: sensor.album_name_asset_limit
 data:
   limit: 20
-  on_this_day: "{{ now().strftime('%Y-%m-%d') }}"
+  memory_date: "{{ now().strftime('%Y-%m-%d') }}"
   order_by: "date"
   order: "ascending"
 ```