Remove Instructions/Feedback + lp_profiles; sync retry, purge, mobile fixes (v0.1.0:104)

Removals (net -570 lines):
- Delete the Instructions and Feedback (feature_requests) pages + backend.
- Retire lp_profiles + investor_type across server, ingest, and seeds; migration
  0008 drops both empty tables (a sanctioned one-off exception to
  never-hard-delete). 0001's lp_profiles ALTER is removed so a fresh DB doesn't
  break the migration chain (live DBs already applied it).

Fixes:
- Email sync: a transient timeout no longer terminally parks a mailbox; the
  scheduler retries 'retrying' each cycle and re-includes errored accounts on an
  hourly backoff, so stuck mailboxes self-heal.
- Mobile Contacts: page through the full directory (server caps 500/page) -- one
  fetch silently truncated at 720, hiding people from the list and from search.
- Mobile email review: clock icon to set a reminder inline; approval cards show
  date/time.

New:
- Admin-only purge of soft-deleted rows (Settings -> Admin; type-to-confirm,
  refuses any row still linked to live data).

Tests: 45/45 (adds test_sync_ready + test_purge_soft_deleted). Reviewer pass
applied (NULL reminders.contact_id on contact purge). Bumped to v0.1.0:104.

backend/email_integration/db.py

@@ -57,10 +57,20 @@ def _json(v) -> str:
 # ------------------------------------------------------------------ email_accounts
 
 def list_sync_ready_accounts(conn: sqlite3.Connection) -> list[sqlite3.Row]:
+    # Ready = healthy ('pending'/'active') + transient-failing ('retrying', retried every
+    # cycle for fast recovery) + 'error' accounts whose last attempt was over an hour ago.
+    # The hour-backoff on 'error' means a terminal failure (auth/permanent) self-heals once
+    # the operator fixes it WITHOUT hammering Google, and un-sticks any mailbox parked by the
+    # pre-v0.1.0:104 bug where one timeout dark-listed it forever. (last_synced_at is stamped
+    # on every attempt, success or fail, so it doubles as the last-attempt clock here.)
     cur = conn.cursor()
     cur.execute(
         "SELECT * FROM email_accounts "
-        "WHERE sync_enabled = 1 AND sync_status IN ('pending','active') "
+        "WHERE sync_enabled = 1 AND ("
+        "  sync_status IN ('pending','active','retrying') "
+        "  OR (sync_status = 'error' AND (last_synced_at IS NULL "
+        "      OR last_synced_at < datetime('now','-1 hour')))"
+        ") "
         "ORDER BY last_synced_at IS NOT NULL, last_synced_at"
     )
     return cur.fetchall()