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### What problem does this PR solve? Closes #15461. RAGFlow had no way to ingest Salesforce CRM data, so support / sales teams couldn't ground responses on live Accounts, Contacts, Opportunities, Cases, or Knowledge articles. This adds a first-class Salesforce data source connector that authenticates against a Connected App via OAuth 2.0 client-credentials, queries selected SObjects via SOQL, and turns each record into an indexable document with incremental sync. **Highlights** - `common/data_source/salesforce_connector.py`: new `SalesforceConnector` (`CheckpointedConnectorWithPermSync` + `SlimConnectorWithPermSync`). - OAuth 2.0 client-credentials flow; canonical `instance_url` from the token response so multi-pod orgs route correctly. - Per-object `SystemModstamp` cursor stored in `SalesforceCheckpoint.cursors` — a failure mid-object doesn't rewind sibling objects, and re-syncs only fetch changed rows. - Deterministic record-to-text formatter (sorted keys) so SOQL field reordering on the server doesn't mark every row "changed" on each poll. - `_get_json` raises on non-2xx so 429 / 5xx never silently advance the checkpoint past missing data. - `Knowledge__kav` is in the default object set but is skipped silently when the org doesn't have Salesforce Knowledge enabled (404 on describe). - Slim-doc IDs are scoped as `<Object>/<Id>` so prune deletes can't collide across object types. - `common/constants.py`, `common/data_source/config.py`, `common/data_source/__init__.py`: register `salesforce` in `FileSource` / `DocumentSource` and export `SalesforceConnector`. - `rag/svr/sync_data_source.py`: new `Salesforce(SyncBase)` class routed through `load_from_checkpoint` (poll_source would re-walk every object each run) and added to `func_factory`. - Frontend: - `web/src/pages/user-setting/data-source/constant/index.tsx`: new `DataSourceKey.SALESFORCE`, form fields (instance URL, client ID/secret, objects, api_version, batch size), `syncDeletedFiles` capability, default form values, and tile entry with the new icon. - `web/src/locales/{en,zh}.ts`: description + per-field tooltips. - `web/src/assets/svg/data-source/salesforce.svg`: 48x48 brand-style icon to match the other Microsoft / cloud tiles. **Verification** - `npm run build` (vite + esbuild) passes (1m 26s). ### Type of change - [x] New Feature (non-breaking change which adds functionality)