Move location/music/ntfy config to .env; add paths to notifications

sky-cam.conf:
- MUSIC_DIR now uses override pattern (MUSIC_DIR="${MUSIC_DIR:-$SCRIPT_DIR/music}")
  so the real path can be set in .env without hardcoding it
- LATITUDE/LONGITUDE use override pattern; set real coords in .env to keep
  location private and out of git
- NTFY_URL now uses override pattern with empty default; set in .env
- NTFY_ENABLED moved out of comments into active config with false default

sunrise.py:
- Reads .env after sky-cam.conf so .env values override (same source order
  as sky-cam.conf itself)
- Handles ${VAR:-default} bash syntax when parsing sky-cam.conf values

All completion notifications now include the full output file path so you
can tell at a glance where the file landed:
- daily_sunrise_video.sh: "filename — Xs, sunrise at HH:MM | /full/path"
- 4-seasons.sh: "filename — Xs | /full/path"
- montage-mvt.sh: "filename | checks | /full/path | verify: ..."
- year-end-join.sh: "filename — Xmin | /full/path" (also adds [cam] to title)

install.sh .env.example now includes LATITUDE, LONGITUDE, MUSIC_DIR, NTFY_URL

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

sunrise.py

@@ -1,26 +1,40 @@
+#!/usr/bin/env python3
 from datetime import datetime
 import pathlib
+import re
+
 import pytz
 from suntime import Sun
 
-# Locate sky-cam.conf next to this script (works regardless of cwd).
 _here = pathlib.Path(__file__).resolve().parent
 
 def _read_conf(path):
     conf = {}
-    with open(path) as f:
-        for line in f:
-            line = line.strip()
-            if line and not line.startswith('#') and '=' in line:
+    try:
+        with open(path) as f:
+            for line in f:
+                line = line.strip()
+                if not line or line.startswith('#') or '=' not in line:
+                    continue
                 k, v = line.split('=', 1)
-                conf[k.strip()] = v.strip()
+                k = k.strip()
+                v = v.strip().strip('"').strip("'")
+                # Extract default from bash ${VAR:-default} pattern
+                m = re.match(r'^\$\{[^}]+:-([^}]*)\}$', v)
+                if m:
+                    v = m.group(1).strip('"').strip("'")
+                conf[k] = v
+    except FileNotFoundError:
+        pass
     return conf
 
 conf = _read_conf(_here / 'sky-cam.conf')
+# .env overrides sky-cam.conf — mirrors the sourcing order at the bottom of sky-cam.conf
+conf.update(_read_conf(_here / '.env'))
 
 for _key in ('LATITUDE', 'LONGITUDE', 'TIMEZONE'):
-    if _key not in conf:
-        raise SystemExit(f"sunrise.py: {_key} not set in sky-cam.conf")
+    if not conf.get(_key):
+        raise SystemExit(f"sunrise.py: {_key} not set in sky-cam.conf or .env")
 
 latitude  = float(conf['LATITUDE'])
 longitude = float(conf['LONGITUDE'])