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feat(paperless): add flexible multi-field custom fields mapping

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Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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@@ -212,11 +212,45 @@ SECURITY_HEADER_CSP_VALUE="default-src 'self'; script-src 'self' https://trusted
### Paperless NGX
| **Variable** | **Description** |
|-----------------------------------|-----------------------------------------------------------------------------------------------------|
| `PAPERLESS_NGX_API_TOKEN` | API token for Paperless NGX. |
| `PAPERLESS_HOST` | Root URL for Paperless NGX (e.g. `https://paperless.example.com`). |
| `PAPERLESS_CUSTOM_FIELD_ABSENDER` | (Optional) Name of the custom field in Paperless-ngx to store the sender ("absender") information. If set, the extracted sender will be automatically set as a custom field after document upload. Example: `Absender` or `Sender` |
| **Variable** | **Description** |
|-------------------------------------|-----------------------------------------------------------------------------------------------------|
| `PAPERLESS_NGX_API_TOKEN` | API token for Paperless NGX. |
| `PAPERLESS_HOST` | Root URL for Paperless NGX (e.g. `https://paperless.example.com`). |
| `PAPERLESS_CUSTOM_FIELD_ABSENDER` | (Optional, Legacy) Name of the custom field in Paperless-ngx to store the sender ("absender") information. If set, the extracted sender will be automatically set as a custom field after document upload. Example: `Absender` or `Sender` |
| `PAPERLESS_CUSTOM_FIELDS_MAPPING` | (Optional, Recommended) JSON mapping of extracted metadata fields to Paperless custom field names. This allows you to map multiple fields at once. Format: `{"metadata_field": "CustomFieldName", ...}`. See examples below. |
#### Custom Fields Mapping Examples
**Single Field (Legacy Method)**:
```bash
PAPERLESS_CUSTOM_FIELD_ABSENDER=Absender
```
**Multiple Fields (Recommended Method)**:
```bash
# Map multiple metadata fields to custom fields in Paperless
PAPERLESS_CUSTOM_FIELDS_MAPPING='{"absender": "Sender", "empfaenger": "Recipient", "language": "Language"}'
```
**All Available Metadata Fields**:
DocuElevate extracts the following fields that can be mapped to Paperless custom fields:
- `absender` - Sender/author of the document
- `empfaenger` - Recipient of the document
- `correspondent` - The issuing entity/company (shortened name)
- `document_type` - Type classification (Invoice, Contract, etc.)
- `language` - Document language (ISO 639-1 code, e.g., "de", "en")
- `kommunikationsart` - Communication type (German classification)
- `kommunikationskategorie` - Communication category (German classification)
- `reference_number` - Invoice/order/reference number if found
- `title` - Human-readable document title
- `tags` - List of thematic keywords (array)
**Complete Example**:
```bash
PAPERLESS_CUSTOM_FIELDS_MAPPING='{"absender": "Sender", "empfaenger": "Recipient", "correspondent": "Correspondent", "language": "Language", "reference_number": "ReferenceNumber"}'
```
**Note**: Custom fields must be created in your Paperless-ngx instance before DocuElevate can use them. The field names in the mapping (right side of the JSON) must exactly match the names in Paperless.
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