Remove all hardcoded deployment values; read from sky-cam.conf

- sunrise_video.10s.sh: use $TIMEZONE (was hardcoded America/New_York),
  $SUNRISE_PRE_MIN/$SUNRISE_POST_MIN for capture window, $SUNRISE_TARGET_SECS
  for output duration (was wrong value 8 in a script named 10s)
- fullday-video.sh: remove hardcoded FULLDAY_FPS/RETENTION_DAYS; both now
  come from sky-cam.conf
- 4-seasons.sh, montage-mvt.sh: export TIMEZONE after sourcing conf so
  season_info.py subprocess picks it up via env rather than falling back
  to its hardcoded America/New_York default
- sky-cam.conf: add SUNRISE_PRE_MIN, SUNRISE_POST_MIN, SUNRISE_TARGET_SECS,
  FULLDAY_FPS, RETENTION_DAYS

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

sunrise_video.10s.sh

@@ -28,11 +28,11 @@ fi
 # Output the sunrise time in UTC
 echo "Sunrise time (UTC): $sunrise_time"
 
-# Set the time zone to Eastern US time (America/New_York)
-export TZ="America/New_York"
+# Export timezone so date and subprocesses use the configured local time.
+export TZ="$TIMEZONE"
 
-# Convert sunrise time from UTC to Eastern Time (ET)
-sunrise_time_et=$(TZ="America/New_York" date -d "$sunrise_time" +"%H-%M-%S")
+# Convert sunrise time from UTC to local time.
+sunrise_time_et=$(TZ="$TIMEZONE" date -d "$sunrise_time" +"%H-%M-%S")
 
 # Output the converted sunrise time in Eastern Time
 echo "Sunrise time (Eastern Time): $sunrise_time_et"
@@ -46,9 +46,9 @@ time_to_seconds() {
 # Convert sunrise time (in Eastern Time) to seconds since midnight
 sunrise_seconds=$(time_to_seconds "$sunrise_time_et")
 
-# Calculate the start and end times (60 minutes before sunrise and 15 minutes after sunrise)
-start_seconds=$((sunrise_seconds - 70 * 60))  # 60 minutes before sunrise
-end_seconds=$((sunrise_seconds + 10 * 60))   # 20 minutes after sunrise
+# Calculate the capture window around sunrise.
+start_seconds=$((sunrise_seconds - SUNRISE_PRE_MIN * 60))
+end_seconds=$((sunrise_seconds + SUNRISE_POST_MIN * 60))
 
 # Output the start and end times in seconds for debugging
 echo "Start seconds: $start_seconds"
@@ -110,8 +110,7 @@ echo "Initial video duration: $video_duration"
 IFS=':' read -r hours minutes seconds <<< $(echo $video_duration | cut -d '.' -f1)  # Extract time
 total_seconds=$(($hours * 3600 + $minutes * 60 + $seconds))  # Convert to total seconds
 
-# Target video duration: 10 seconds
-target_duration=8
+target_duration=$SUNRISE_TARGET_SECS
 
 # Calculate the speed-up factor to make the video fit into the target duration of 10 seconds
 speed_up_factor=$(echo "scale=3; $total_seconds / $target_duration" | bc)