Align Go ingestion boundaries with Python (#16647)

Moves doc_id blob resolution into Parser, tightens chunker/tokenizer to
Python output_format semantics, updates extractor list handling, and
fixes real-template integration tests.

internal/parser/parser/ppt_parser.go

@@ -0,0 +1,58 @@
+//go:build cgo
+
+//
+// Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+package parser
+
+import (
+	"fmt"
+)
+
+type PPTParser struct {
+	libType string
+}
+
+func NewPPTParser(libType string) (*PPTParser, error) {
+	switch libType {
+	case OfficeOxide:
+		return &PPTParser{
+			libType: OfficeOxide,
+		}, nil
+	default:
+		return nil, fmt.Errorf("unsupported PPT library type: %s", libType)
+	}
+}
+
+func (p *PPTParser) String() string {
+	return "PPTParser"
+}
+
+// ParseWithResult delegates to PPTXParser's structured output
+// for the legacy PPT format. The two file families differ only
+// in the binary container; the python parser.py:slides branch
+// treats them uniformly.
+func (p *PPTParser) ParseWithResult(filename string, data []byte) ParseResult {
+	delegate, err := NewPPTXParser(OfficeOxide)
+	if err != nil {
+		return ParseResult{Err: fmt.Errorf("ppt delegate: %w", err)}
+	}
+	res := delegate.ParseWithResult(filename, data)
+	if res.File != nil {
+		res.File["format"] = "ppt"
+	}
+	return res
+}