rename: the server is Inkwell — package, env vars, image, compose, export marker

Step 2 of milestone 481. The operator chose a full rename (Scribe note 5071), so
this goes past the display strings into the identities:

- src/thoughtsync → src/inkwell; every import, the Dockerfile and both compose
  commands, alembic env, pyproject
- THOUGHTSYNC_* → INKWELL_* (database URL, secret key, log level, tag/port/bind)
- container data dir /var/thoughtsync → /var/inkwell
- image git.fabledsword.com/bvandeusen/inkwell; Postgres user/db default inkwell;
  CI's integration service follows
- the files the image serves are inkwell.*. fetch-clients.sh still fetches the
  thoughtsync-named release assets, because the lanes that publish them are
  renamed in steps 3 and 4
- exports are written with app "inkwell"

Two deliberate exceptions, both because data rides on them:

- compose volumes are now named explicitly and overridable (INKWELL_DB_VOLUME,
  INKWELL_DATA_VOLUME), so a deployment installed as ThoughtSync points at the
  volumes and DB identity it already has. .env.example says exactly what to set
- import still accepts app "thoughtsync", because exports written before the
  rename are backups. Tested both ways

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_integration.py

@@ -22,20 +22,20 @@ import pytest
 import pytest_asyncio
 from sqlalchemy import select, text
 
-from thoughtsync import ratelimit
-from thoughtsync.app import create_app
-from thoughtsync.db import dispose_engine, session_scope
-from thoughtsync.models.label import NoteLabel
-from thoughtsync.models.note import Note
-from thoughtsync.models.user import User
-from thoughtsync.notes.tags import _lift_and_reconcile_tags
-from thoughtsync.settings import get_setting, live, refresh_live, reset_live, set_settings
-from thoughtsync.notes.checklist import parse_items, set_item_checked
-from thoughtsync.notes.helpers import derive_display_title
-from thoughtsync.models.note_link_preview import NoteLinkPreview
-from thoughtsync.models.note_revision import NoteRevision
-from thoughtsync.revisions import REVISION_WINDOW_MINUTES, should_snapshot
-from thoughtsync.unfurl_queue import _unfurl_new_urls, detect_urls
+from inkwell import ratelimit
+from inkwell.app import create_app
+from inkwell.db import dispose_engine, session_scope
+from inkwell.models.label import NoteLabel
+from inkwell.models.note import Note
+from inkwell.models.user import User
+from inkwell.notes.tags import _lift_and_reconcile_tags
+from inkwell.settings import get_setting, live, refresh_live, reset_live, set_settings
+from inkwell.notes.checklist import parse_items, set_item_checked
+from inkwell.notes.helpers import derive_display_title
+from inkwell.models.note_link_preview import NoteLinkPreview
+from inkwell.models.note_revision import NoteRevision
+from inkwell.revisions import REVISION_WINDOW_MINUTES, should_snapshot
+from inkwell.unfurl_queue import _unfurl_new_urls, detect_urls
 
 pytestmark = pytest.mark.integration
 
@@ -305,7 +305,7 @@ async def test_auto_unfurl_stores_a_preview_and_skips_what_is_cached(db, owner,
         calls.append(url)
         return {"url": url, "title": f"T {url}", "description": None, "image_url": None, "site_name": "example.com"}
 
-    monkeypatch.setattr("thoughtsync.unfurl_queue.unfurl", fake_unfurl)
+    monkeypatch.setattr("inkwell.unfurl_queue.unfurl", fake_unfurl)
 
     await _unfurl_new_urls(note.id, note.body)
     assert sorted(calls) == ["https://example.com/a", "https://example.com/b"]
@@ -331,7 +331,7 @@ async def test_auto_unfurl_drops_a_preview_whose_url_left_the_body(db, owner, mo
         # Simulate the body changing while the request was in the air.
         return {"url": url, "title": "T", "description": None, "image_url": None, "site_name": None}
 
-    monkeypatch.setattr("thoughtsync.unfurl_queue.unfurl", fake_unfurl)
+    monkeypatch.setattr("inkwell.unfurl_queue.unfurl", fake_unfurl)
     note.body = "changed my mind"
     await db.commit()
 
@@ -352,7 +352,7 @@ async def test_detection_agrees_with_what_gets_stored(db, owner, monkeypatch):
     async def fake_unfurl(url):
         return {"url": url, "title": "T", "description": None, "image_url": None, "site_name": None}
 
-    monkeypatch.setattr("thoughtsync.unfurl_queue.unfurl", fake_unfurl)
+    monkeypatch.setattr("inkwell.unfurl_queue.unfurl", fake_unfurl)
     await _unfurl_new_urls(note.id, body)
 
     stored = {