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/scripts/seed_synthetic.py

@@ -11,8 +11,8 @@ What it builds (into a SEPARATE dev DB, never crm.db):
     core migration (backend/migrations/), so the canonical/interaction/graph
     tables exist.
   * A classic-model dataset: organizations, contacts (investors + prospects),
-    opportunities across pipeline stages, communications with entity-rich prose
-    notes, and lp_profiles.
+    opportunities across pipeline stages, and communications with entity-rich
+    prose notes.
   * A fundraising grid (fundraising_state.grid_json) populated via the real
     sync_fundraising_relational() code path, so the normalized mirror + the
     grid->classic bridge behave exactly as in production.
@@ -179,7 +179,7 @@ def main():
              f"Prospect sourced via {random.choice(['X DM', 'warm intro', 'podcast'])}.", uid, now()))
         contacts.append((cid, first, last, org_name, "prospect"))
 
-    # ── opportunities + lp_profiles + communications ──
+    # ── opportunities + communications ──
     stages = server.PIPELINE_STAGES
     for idx, (cid, first, last, org_name, ctype) in enumerate(contacts):
         person = f"{first} {last}"
@@ -199,19 +199,6 @@ def main():
                  random.choice(["Send deck", "Schedule call", "Await IC", "Send subdocs"]),
                  uid, random.choice(["low", "medium", "high"]), now()))
 
-        # lp_profile for ~closed investors
-        if ctype == "investor" and idx % 2 == 0:
-            amt = random.choice(AMOUNTS)
-            conn.execute(
-                "INSERT INTO lp_profiles (id, contact_id, commitment_amount, funded_amount, commitment_date, "
-                "fund_name, investor_type, accredited, legal_docs_signed, wire_received, k1_sent, notes, updated_at) "
-                "VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?)",
-                (gen(), cid, amt, amt if idx % 4 == 0 else 0, past(120),
-                 random.choice(list(FUND_LABELS.values())),
-                 random.choice(["family_office", "institutional", "endowment", "individual"]),
-                 1, 1 if idx % 3 else 0, 1 if idx % 4 == 0 else 0, 0,
-                 f"Closed LP. Accreditation on file. Primary contact {person}.", now()))
-
         # 2-4 communications each, entity-rich prose
         for k in range(random.randint(2, 4)):
             ctype_comm, subj, body = random.choice(COMM_TEMPLATES)
@@ -275,7 +262,7 @@ def main():
 
     print(f"\nSynthetic dev DB written to: {db}")
     print("  Classic model:")
-    for t in ("organizations", "contacts", "opportunities", "communications", "lp_profiles"):
+    for t in ("organizations", "contacts", "opportunities", "communications"):
         print(f"    {t:<24} {count(t)}")
     print("  Fundraising grid (after real sync):")
     for t in ("fundraising_investors", "fundraising_contacts", "fundraising_funds",