feat(projects): per-module status (independent sound/vibration lifecycle)

Each ProjectModule now carries its own status (active|on_hold|completed)
so one half of a combined project can wrap up while the other keeps
running — e.g. mark Sound "completed" while Vibration stays "active",
without archiving the whole project.

- models.py: ProjectModule.status column (default 'active')
- migrate_add_module_status.py: idempotent ALTER (run on prod before deploy)
- projects.py: _get_module_statuses() helper, MODULE_STATUSES, and a
  PUT /{id}/modules/{type}/status endpoint; module_status now included in
  the project GET, header, and /list contexts so the UI can render it.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015m9FuJvk65kJmmP3c9c6r1

backend/migrate_add_module_status.py

@@ -0,0 +1,54 @@
+"""
+Migration: add a per-module `status` column to `project_modules`.
+
+A combined project (sound + vibration) often finishes one kind of work before
+the other.  Rather than archiving the whole project, each module now carries its
+own lifecycle so e.g. the sound side can read "Completed" while vibration stays
+"Active".
+
+Behavior:
+  - status = 'active'    → module is live (default for all existing rows)
+  - status = 'on_hold'   → paused; data/tabs stay visible
+  - status = 'completed' → wrapped up; surfaced as a done badge
+
+Idempotent — safe to re-run.  Non-destructive — adds only.
+
+Run with:
+  docker exec terra-view-terra-view-1 python3 /app/backend/migrate_add_module_status.py
+"""
+
+import os
+import sqlite3
+
+DB_PATH = "./data/seismo_fleet.db"
+
+
+def _has_column(cur: sqlite3.Cursor, table: str, column: str) -> bool:
+    cur.execute(f"PRAGMA table_info({table})")
+    return any(row[1] == column for row in cur.fetchall())
+
+
+def migrate_database() -> None:
+    if not os.path.exists(DB_PATH):
+        print(f"Database not found at {DB_PATH}")
+        return
+
+    conn = sqlite3.connect(DB_PATH)
+    cur = conn.cursor()
+
+    if not _has_column(cur, "project_modules", "status"):
+        cur.execute(
+            "ALTER TABLE project_modules ADD COLUMN status TEXT NOT NULL DEFAULT 'active'"
+        )
+        conn.commit()
+        print("  Added column project_modules.status (default 'active').")
+    else:
+        print("  project_modules already has status — nothing to do.")
+
+    conn.close()
+
+
+if __name__ == "__main__":
+    print("Running migration: add status to project_modules")
+    migrate_database()
+    print("Done.")