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### What problem does this PR solve? Closes #15465. RAGFlow supports S3, Google Cloud Storage, R2, and OCI as data sources but not Azure Blob Storage, leaving Azure users without a way to index container objects into a knowledge base. This adds a first-class Azure Blob Storage data-source connector — distinct from RAGFlow's existing Azure storage *backends* (`rag/utils/azure_sas_conn.py`, `rag/utils/azure_spn_conn.py`) which store RAGFlow's own files. **Highlights** - `common/data_source/azure_blob_connector.py`: new `AzureBlobConnector` (`CheckpointedConnectorWithPermSync` + `SlimConnectorWithPermSync`). - Uses the existing `azure-storage-blob` dependency (already in `pyproject.toml`). - Three auth modes, tried in order of precedence: 1. **Account key** — `account_name` + `account_key` + `container_name`. 2. **Connection string** — `connection_string` + `container_name`. 3. **SAS token** — `container_url` + `sas_token` (same shape as `RAGFlowAzureSasBlob`). - ETag fingerprint stored per blob in `AzureBlobCheckpoint.etags` — unchanged blobs (same ETag as last run) are skipped without a download. Only new/modified blobs are fetched. - Optional `prefix` scopes indexing to a virtual folder. - `validate_connector_settings()` probes `get_container_properties()` and maps `AuthenticationFailed / 403 / ContainerNotFound` to typed connector exceptions. - Slim-doc IDs are blob names so prune reconciles correctly. - `common/constants.py`, `common/data_source/config.py`, `common/data_source/__init__.py`: register `azure_blob` in `FileSource` / `DocumentSource` and export `AzureBlobConnector`. - `rag/svr/sync_data_source.py`: new `AzureBlob(SyncBase)` class routed through `load_from_checkpoint` (ETag fingerprint owns change-detection) and added to `func_factory`. - Frontend: - `web/src/pages/user-setting/data-source/constant/index.tsx`: new `DataSourceKey.AZURE_BLOB`, auth-mode selector (account key / connection string / SAS token), all credential fields, prefix + batch-size, `syncDeletedFiles` capability, default form values, tile entry with icon. - `web/src/locales/{en,zh}.ts`: description + per-field tooltips for all 9 new keys. - `web/src/assets/svg/data-source/azure-blob.svg`: Azure-branded stacked-cylinders icon. **Verification** - `npm run build` (vite + esbuild) passes (37 s). ### Type of change - [x] New Feature (non-breaking change which adds functionality)