Remove duplicated AddContactIn/add_contact/delete_all_contacts in vm_api.py

The contact create/delete endpoints and their Pydantic model were defined
twice (identical blocks). Python kept the second definition, so the first was
dead code. Drop the duplicate; module still compiles and each symbol is now
defined exactly once.

src/vm_api.py

@@ -582,53 +582,3 @@ def delete_all_contacts(vm_session: str = Cookie(default=None)):
     return {"ok": True}
 
 
-class AddContactIn(BaseModel):
-    number: str = ""
-    name: str
-    email: str | None = None
-
-
-@app.post("/api/add_contact")
-async def add_contact(body: AddContactIn, vm_session: str = Cookie(default=None)):
-    mb = _current_user(vm_session)[0]
-    num = (body.number or "").strip()
-    name = (body.name or "").strip()
-    email = (body.email or "").strip() or None
-    if not name:
-        raise HTTPException(400, "Name is required")
-    normalized = vm_contacts.normalize_uk(vm_contacts.digits_of(num)) if num else None
-    con = vm_store.connect()
-    if normalized:
-        row = con.execute(
-            "SELECT id FROM contacts WHERE number_e164 = ?", (normalized,)
-        ).fetchone()
-        if row and row.get("id"):
-            con.execute(
-                "UPDATE contacts SET name=?, email=?, updated_at=NOW() WHERE id=?",
-                (name, email, row["id"]),
-            )
-        else:
-            con.execute(
-                "INSERT INTO contacts (number_e164, name, email) VALUES (?, ?, ?)",
-                (normalized, name, email),
-            )
-        con.execute(
-            "UPDATE messages SET contact_name=?, contact_email=? "
-            "WHERE (REPLACE(REPLACE(callerid, ' ', ''), '\"', '') LIKE ? "
-            "   OR REPLACE(REPLACE(callerid, ' ', ''), '\"', '') LIKE ?) "
-            "AND (contact_name IS NULL OR contact_name = '')",
-            (name, email, "%%%s%%" % normalized, "%%%s%%" % normalized.replace("+44", "0"),),
-        )
-    con.commit()
-    con.close()
-    return {"ok": True}
-
-
-@app.post("/api/contacts/delete_all")
-def delete_all_contacts(vm_session: str = Cookie(default=None)):
-    _current_user(vm_session)
-    con = vm_store.connect()
-    con.execute("DELETE FROM contacts")
-    con.commit()
-    con.close()
-    return {"ok": True}