feat: add WatchMedium field, general review editing, configurable deploy

- WatchMedium enum (cinema/streaming/tv/physical_media/download/media_server/other)
- PATCH /api/v1/reviews/:id partial update (rating, comment, watched_at, watch_medium)
- edit_review use case w/ ownership + remote review guard, best-effort AP Update broadcast
- SPA: icon picker, edit sheet (long-press mobile / pencil desktop), watch medium badge
- shared ReviewFormFields, EditableContextMenu, parse_watched_at/format_watched_at
- deploy.sh parameterized (--features, --tag), CORS allows PATCH
- CONTEXT.md glossary, ADR-0001 general review editing

CONTEXT.md

@@ -0,0 +1,13 @@
+# Movies Diary
+
+A personal movie diary that tracks what you watch, when, and what you thought about it. Supports federation via ActivityPub.
+
+## Language
+
+**Review**:
+A single record of watching a movie — captures the rating, optional comment, when it was watched, and how it was watched.
+_Avoid_: Diary entry, watch, log entry
+
+**WatchMedium**:
+The channel through which a movie was watched: Cinema, Streaming, TV, PhysicalMedia, Download, MediaServer, or Other.
+_Avoid_: Source, format, venue, platform