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### What problem does this PR solve? Fixes #13285 When an LLM returns a transient error (e.g. overloaded) during parsing, the task progress is set to -1. Previously, the progress could never be updated again, leaving the document permanently stuck in FAIL status even after the task successfully recovered and completed. Three coordinated changes address this: 1. task_service.update_progress: relax the progress update guard to accept prog >= 1 even when current progress is -1, so a task that recovers from a transient failure can report completion. 2. document_service.get_unfinished_docs: include documents that are marked FAIL (progress == -1) but still have at least one non-failed task (task.progress >= 0) in the polling set, so their status can be re-synced once a task recovers. Documents where all tasks have permanently failed are excluded to avoid unnecessary polling. 3. document_service.update_progress: explicitly set document status to RUNNING when not all tasks have finished, instead of preserving whatever stale status (potentially FAIL) the document previously had. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)