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>

docker-compose.dev.yml

@@ -14,15 +14,15 @@ services:
   db:
     image: postgres:16-alpine
     environment:
-      POSTGRES_USER: thoughtsync
-      POSTGRES_PASSWORD: thoughtsync
-      POSTGRES_DB: thoughtsync
+      POSTGRES_USER: inkwell
+      POSTGRES_PASSWORD: inkwell
+      POSTGRES_DB: inkwell
     volumes:
-      - thoughtsync-dev-db:/var/lib/postgresql/data
+      - inkwell-dev-db:/var/lib/postgresql/data
     ports:
       - "5432:5432"
     healthcheck:
-      test: ["CMD-SHELL", "pg_isready -U thoughtsync"]
+      test: ["CMD-SHELL", "pg_isready -U inkwell"]
       interval: 5s
       timeout: 5s
       retries: 10
@@ -34,22 +34,22 @@ services:
       db:
         condition: service_healthy
     environment:
-      THOUGHTSYNC_DATABASE_URL: postgresql+asyncpg://thoughtsync:thoughtsync@db:5432/thoughtsync
+      INKWELL_DATABASE_URL: postgresql+asyncpg://inkwell:inkwell@db:5432/inkwell
       PYTHONPATH: /app/src
     volumes:
       - ./pyproject.toml:/app/pyproject.toml
       - ./alembic.ini:/app/alembic.ini
       - ./alembic:/app/alembic
       - ./src:/app/src
-      - thoughtsync-dev-data:/var/thoughtsync
+      - inkwell-dev-data:/var/inkwell
     ports:
       - "5000:5000"
     # Install deps, wait for the DB, run migrations, then serve with live reload.
     command: >
       sh -c "pip install --quiet -e . &&
-             python -m thoughtsync.dbwait &&
+             python -m inkwell.dbwait &&
              alembic upgrade head &&
-             hypercorn 'thoughtsync.app:create_app()' --bind 0.0.0.0:5000 --reload"
+             hypercorn 'inkwell.app:create_app()' --bind 0.0.0.0:5000 --reload"
 
   web:
     image: node:22-alpine
@@ -67,5 +67,5 @@ services:
     command: sh -c "npm install && npm run dev -- --host 0.0.0.0"
 
 volumes:
-  thoughtsync-dev-db:
-  thoughtsync-dev-data:
+  inkwell-dev-db:
+  inkwell-dev-data: