Move some constants to common (#11004)

### What problem does this PR solve?

As title.

### Type of change

- [x] Refactoring

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

rag/app/audio.py

@@ -18,7 +18,7 @@ import os
 import re
 import tempfile
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from rag.nlp import rag_tokenizer, tokenize
 

rag/app/laws.py

@@ -20,7 +20,7 @@ import re
 from io import BytesIO
 from docx import Document
 
-from api.db import ParserType
+from common.constants import ParserType
 from deepdoc.parser.utils import get_text
 from rag.nlp import bullets_category, remove_contents_table, \
     make_colon_as_title, tokenize_chunks, docx_question_level, tree_merge

rag/app/manual.py

@@ -18,7 +18,7 @@ import logging
 import copy
 import re
 
-from api.db import ParserType
+from common.constants import ParserType
 from io import BytesIO
 from rag.nlp import rag_tokenizer, tokenize, tokenize_table, bullets_category, title_frequency, tokenize_chunks, docx_question_level
 from common.token_utils import num_tokens_from_string

rag/app/naive.py

@@ -28,7 +28,7 @@ from markdown import markdown
 from PIL import Image
 from tika import parser
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from rag.utils.file_utils import extract_embed_file, extract_links_from_pdf, extract_links_from_docx, extract_html
 from deepdoc.parser import DocxParser, ExcelParser, HtmlParser, JsonParser, MarkdownElementExtractor, MarkdownParser, PdfParser, TxtParser

rag/app/paper.py

@@ -19,7 +19,7 @@ import copy
 import re
 
 from deepdoc.parser.figure_parser import vision_figure_parser_pdf_wrapper
-from api.db import ParserType
+from common.constants import ParserType
 from rag.nlp import rag_tokenizer, tokenize, tokenize_table, add_positions, bullets_category, title_frequency, tokenize_chunks
 from deepdoc.parser import PdfParser, PlainParser
 import numpy as np

rag/app/picture.py

@@ -20,7 +20,7 @@ import re
 import numpy as np
 from PIL import Image
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from deepdoc.vision import OCR
 from rag.nlp import rag_tokenizer, tokenize

rag/app/presentation.py

@@ -20,7 +20,7 @@ from io import BytesIO
 
 from PIL import Image
 
-from api.db import LLMType
+from common.constants import LLMType
 from api.db.services.llm_service import LLMBundle
 from deepdoc.parser.pdf_parser import VisionParser
 from rag.nlp import tokenize, is_english