Jack b59d6e8ba1 refactor(ingestion/task): extract index-doc mapping into task/indexdoc package (#17749) ...

## Summary
Extract the pipeline-output → search-engine index document mapping
helpers out of the `task` package into a dedicated, dependency-light
leaf package `internal/ingestion/task/indexdoc`.

These functions are pure transforms (they only depend on
`common`/`utility`) and are not task-orchestration concerns:
- `NormalizeChunks`, `DeepCopyChunks` (was unexported `deepCopyChunks`),
`toChunkMaps` → `indexdoc/normalize.go`
- `ProcessChunksForPipeline`, `RenameTextToContentWithWeight`,
`GetEmbeddingTokenConsumption`, `cleanupConsumedChunkFields`,
`mergeChunkMetadata`, `processChunkPositions`,
`AggregateTableDocMetadata`, `resolveTableColumnConfig` →
`indexdoc/process.go`
- `AddPositions` → `indexdoc/position.go`
- `EmbeddingTokenConsumptionKey` constant → `indexdoc/constants.go`
(task/constants.go keeps only `GRAPH_RAPTOR_FAKE_DOC_ID`)

Call sites in `pipeline_executor.go` and `golden_compare.go` now
reference the `indexdoc` package; package-task tests qualify the moved
symbols.

## Why
The `task` package had grown into a "orchestration + pure mapping +
debug" mix. Splitting the pure mapping helpers into a leaf package
sharpens package boundaries, removes a misleading top-level
`ingestion/chunk` candidate (there are already `parser/chunk` and
`service/chunk`), and lets the golden tool / future reuse pull in the
mapping logic without dragging in `task`'s `dao`/`engine`/`service`
dependency graph (Go subpackage import does not pull in the parent).

## Test plan
- `build.sh --test ./internal/ingestion/task/...` — **green** (task
4.7s, indexdoc 0.007s), matching the pre-change baseline.
- `gofmt` clean; `build.sh` builds both `ragflow-cli` and
`ragflow_server` successfully.
- Integration/E2E tiers are delegated to CI (need real MySQL/MinIO/ES
services).

Note: `pipeline_e2e_test.go` has a **pre-existing** compile error
(`server.ElasticsearchConfig` / `server.InfinityConfig` are now defined
under `internal/server/config/`, not re-exported by `internal/server`).
This is unrelated to this change — the diff to that file is only the
added `indexdoc` import and the qualified `EmbeddingTokenConsumptionKey`
reference.

2026-08-04 10:05:27 +08:00

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