Add security tests for path traversal and SQL injection fixes

Created comprehensive test coverage for security fixes:

- internal/api/obsidian_test.go:
  * TestGetNotes_SymlinkSecurity: Verifies symlinks are not followed
  * TestGetNotes_BasicFunctionality: Tests basic limit and ordering
  * Uses t.TempDir() for isolated test environments

- internal/store/sqlite_test.go:
  * TestGetNotes_LimitClause: Validates LIMIT parameter handling
  * TestGetNotes_EmptyDatabase: Tests empty state
  * TestSaveNotes_Upsert: Verifies INSERT OR REPLACE behavior
  * TestGetNotes_SQLInjectionAttempt: Confirms parameterized queries
  * All tests use temporary SQLite databases for isolation

All tests passing (7 new test cases). Security fixes from commits
325811c and 4c03e9c now have full test coverage.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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