refactor(storage): remove 0.5 credential compatibility

[AptS-1547]

Summary

Closes #463.

This PR finalizes the AsterDrive 0.5.1 storage-policy schema boundary:

• adds the final storage-policy cleanup migration;
• rejects pre-0.5.1 databases with unmigrated legacy credentials before any DDL;
• drops empty legacy credential tables, policy compatibility columns, indexes, and the remote-node foreign key;
• removes the 0.5.x startup importer, connector legacy import hooks, deprecated entities/repositories, OneDrive legacy OAuth conversion, and migration-only tests;
• updates database-migrate to copy only current policy envelopes and connector-owned credentials, while rejecting unmigrated legacy source data;
• documents the release in CHANGELOG.md under v0.5.1.

Validation

• cargo check -p aster_drive_migration
• cargo check -p aster_drive --lib
• cargo check -p aster_drive --tests
• cargo test -p aster_drive_migration --lib
• cargo test -p aster_drive --test platform migrations::
• focused 0.5.1 legacy cleanup tests for rejection-before-DDL, empty-store cleanup, idempotency, and SQLite FK preservation
• cargo fmt --all -- --check
• git diff --check

The complete platform matrix was started separately; external PostgreSQL/MySQL smoke coverage remains environment-dependent.

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Review details

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between a3dd0ee and c50924f.

📒 Files selected for processing (33)

• CHANGELOG.md
• crates/aster_drive_migration/src/lib.rs
• crates/aster_drive_migration/src/m20260820_000001_remove_storage_policy_legacy.rs
• crates/aster_drive_model/src/deprecated/mod.rs
• crates/aster_drive_model/src/deprecated/storage_connector_application_config.rs
• crates/aster_drive_model/src/deprecated/storage_policy_credential.rs
• crates/aster_drive_model/src/lib.rs
• src/cli/database_migration/apply/convert.rs
• src/cli/database_migration/apply/mod.rs
• src/cli/database_migration/mod.rs
• src/cli/database_migration/schema.rs
• src/db/repository/mod.rs
• src/db/repository/storage_connector_application_config_repo.rs
• src/db/repository/storage_policy_credential_repo.rs
• src/runtime/startup/common.rs
• src/services/preview/wopi/targets.rs
• src/services/storage_policy/credential/migration.rs
• src/services/storage_policy/credential/mod.rs
• src/storage/connectors/azure_blob.rs
• src/storage/connectors/common.rs
• src/storage/connectors/contract.rs
• src/storage/connectors/mod.rs
• src/storage/connectors/models.rs
• src/storage/connectors/onedrive.rs
• src/storage/connectors/s3.rs
• src/storage/connectors/sftp.rs
• src/storage/connectors/tencent_cos.rs
• src/storage/connectors/test_support.rs
• tests/legacy_storage_credential_migration.rs
• tests/operations/cli.rs
• tests/platform/database_backends.rs
• tests/platform/migrations.rs
• tests/platform/schema_drift.rs

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[astercommunity-automation]

PR readiness for c50924f721a1

Fact	Value
Blocking conditions	1
Waiting conditions	0
Current unresolved threads	0
Current-head approvals	0
Stale latest reviews	0

• BLOCK: Current head requires a human approval

This report is deterministic and updated for the current pull request head.

[astercommunity-automation]

CI diagnostics resolved for c50924f721a1

Workflow	Result	First failing job/step
Rust CI	PASS	-
E2E	PASS	-
Docs Check	PASS	-
Multi-Primary E2E	PASS	-

This comment is updated in place for the latest PR head.

[codecov]

Codecov Report

❌ Patch coverage is 86.17021% with 39 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/cli/database_migration/schema.rs	58.57%	29 Missing ⚠️
...c/m20260820_000001_remove_storage_policy_legacy.rs	94.41%	10 Missing ⚠️

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