Fix ruff lint errors across codebase

- Auto-fix F401 (unused imports) and I001 (unsorted imports) with ruff --fix
- Manually fix E501 (line too long) in alembic migrations and src/ models
- Run ruff format to ensure consistent formatting

Co-Authored-By: Paperclip <noreply@paperclip.ing>

alembic/versions/007_bootstrap_users_table.py

@@ -27,7 +27,8 @@ def upgrade() -> None:
     if inspector.has_table("users"):
         return  # Table already exists (non-fresh DB or create_all already ran)
 
-    conn.execute(text("""
+    conn.execute(
+        text("""
         CREATE TABLE users (
             id TEXT PRIMARY KEY,
             email VARCHAR(255) NOT NULL UNIQUE,
@@ -36,11 +37,20 @@ def upgrade() -> None:
             email_verified BOOLEAN NOT NULL DEFAULT false,
             image TEXT,
             email_inbound_token VARCHAR(22) NOT NULL UNIQUE
-                DEFAULT replace(replace(trim(trailing '=' from encode(gen_random_bytes(16), 'base64')), '+', '-'), '/', '_'),
+                DEFAULT (
+                    replace(
+                        replace(
+                            trim(trailing '=' from encode(gen_random_bytes(16), 'base64')),
+                            '+', '-'
+                        ),
+                        '/', '_'
+                    )
+                ),
             created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
             updated_at TIMESTAMPTZ NOT NULL DEFAULT now()
         )
-    """))
+    """)
+    )
 
 
 def downgrade() -> None: