Refactor check_visibility() to use Resource objects, refs #2537

Updated check_visibility() method signature to accept Resource objects
(DatabaseResource, TableResource, QueryResource) instead of plain strings
and tuples.

Changes:
- Updated check_visibility() signature to only accept Resource objects
- Added validation with helpful error message for incorrect types
- Updated all check_visibility() calls throughout the codebase:
  - datasette/views/database.py: Use DatabaseResource and QueryResource
  - datasette/views/special.py: Use DatabaseResource and TableResource
  - datasette/views/row.py: Use TableResource
  - datasette/views/table.py: Use TableResource
  - datasette/app.py: Use TableResource in expand_foreign_keys
- Updated tests to use Resource objects
- Updated documentation in docs/internals.rst:
  - Removed outdated permissions parameter
  - Updated examples to use Resource objects

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

tests/test_internals_datasette.py

@@ -5,6 +5,7 @@ Tests for the datasette.app.Datasette class
 import dataclasses
 from datasette import Forbidden, Context
 from datasette.app import Datasette, Database
+from datasette.resources import DatabaseResource
 from itsdangerous import BadSignature
 import pytest
 
@@ -93,7 +94,7 @@ ALLOW_ROOT = {"allow": {"id": "root"}}
             None,
             {"databases": {"_memory": ALLOW_ROOT}},
             "view-database",
-            "_memory",
+            DatabaseResource(database="_memory"),
             False,
             False,
         ),
@@ -101,7 +102,7 @@ ALLOW_ROOT = {"allow": {"id": "root"}}
             ROOT,
             {"databases": {"_memory": ALLOW_ROOT}},
             "view-database",
-            "_memory",
+            DatabaseResource(database="_memory"),
             True,
             True,
         ),