- Changed InstanceProfile to include admin user field
- Updated GetInstanceProfile method to retrieve admin user
- Modified related tests to reflect changes in admin user retrieval
- Removed owner cache logic and tests, introducing new admin cache tests

Co-authored-by: Local Admin <root@localhost>

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

Signed-off-by: Salman Muin Kayser Chishti <13schishti@gmail.com>

- Removed the owner field from InstanceProfile as it is no longer needed.
- Added an initialized field to InstanceProfile to indicate if the instance has completed first-time setup.
- Updated GetInstanceProfile method to set initialized based on the existence of an admin user.
- Modified tests to reflect changes in InstanceProfile and ensure correct behavior regarding instance initialization.
- Adjusted frontend logic to redirect users based on the initialized status instead of the owner field.

- Updated the isSuperUser function to only check for ADMIN role.
- Added SQL migration scripts for MySQL, PostgreSQL, and SQLite to change user roles from HOST to ADMIN.
- Created a new SQLite migration to alter the user table structure and ensure data integrity during the migration process.

test: enhance memo filter tests with COALESCE for JSON extraction and add migration data persistence tests

Allow API users to set custom create_time, update_time, and display_time
when creating memos and comments. This enables importing historical data
with accurate timestamps.

Changes:
- Update proto definitions: change create_time and update_time from
  OUTPUT_ONLY to OPTIONAL to allow setting on creation
- Modify CreateMemo service to handle custom timestamps from request
- Update database drivers (SQLite, MySQL, PostgreSQL) to support
  inserting custom timestamps when provided
- Add comprehensive test coverage for custom timestamp functionality
- Maintain backward compatibility: auto-generated timestamps still
  work when custom values are not provided
- Fix golangci-lint issues in plugin/filter (godot and revive)

Fixes #5483

Add support for CEL exists() comprehension with startsWith, endsWith, and
contains predicates to enable powerful tag filtering patterns.

Features:
- tags.exists(t, t.startsWith("prefix")) - Match tags by prefix
- tags.exists(t, t.endsWith("suffix")) - Match tags by suffix
- tags.exists(t, t.contains("substring")) - Match tags by substring
- Negation: !tags.exists(...) to exclude matching tags
- Works with all operators (AND, OR, NOT) and other filters

Implementation:
- Added ListComprehensionCondition IR type for comprehension expressions
- Parser detects exists() macro and extracts predicates
- Renderer generates optimized SQL for SQLite, MySQL, PostgreSQL
- Proper NULL/empty array handling across all database dialects
- Helper functions reduce code duplication

Design decisions:
- Only exists() supported (all() rejected at parse time with clear error)
- Only simple predicates (matches() excluded to avoid regex complexity)
- Fail-fast validation with helpful error messages

Tests:
- Comprehensive test suite covering all predicates and edge cases
- Tests for NULL/empty arrays, combined filters, negation
- Real-world use case test for Issue #5480 (archive workflow)
- All tests pass on SQLite, MySQL, PostgreSQL

Closes #5480

- Suppress revive redundant-test-main-exit warning with //nolint
- Fix data race in cache.Clear() by using Delete() instead of map replacement
- Both changes maintain correct behavior while fixing CI failures