Wrap common API query parameters into shared class to deduplicate code

- Upgrade FastAPI to >= latest version. Required upgrade of FastAPI.
  Earlier version didn't support wrapping common query params in class

- Use per fixture app instead of a global FastAPI app in conftest

- Upgrade minimum required Django version

- Fix no notes chat director test with updated no notes message
  No notes message was updated in commit 118f1143

src/khoj/routers/api.py

@@ -4,7 +4,7 @@ import math
 import time
 import logging
 import json
-from typing import List, Optional, Union, Any
+from typing import Annotated, List, Optional, Union, Any
 
 # External Packages
 from fastapi import APIRouter, Depends, HTTPException, Header, Request
@@ -31,6 +31,7 @@ from khoj.utils import state, constants
 from khoj.utils.helpers import AsyncIteratorWrapper, get_device
 from fastapi.responses import StreamingResponse, Response
 from khoj.routers.helpers import (
+    CommonQueryParams,
     get_conversation_command,
     validate_conversation_config,
     agenerate_chat_response,
@@ -354,15 +355,12 @@ def get_config_types(
 async def search(
     q: str,
     request: Request,
+    common: CommonQueryParams,
     n: Optional[int] = 5,
     t: Optional[SearchType] = SearchType.All,
     r: Optional[bool] = False,
     max_distance: Optional[Union[float, None]] = None,
     dedupe: Optional[bool] = True,
-    client: Optional[str] = None,
-    user_agent: Optional[str] = Header(None),
-    referer: Optional[str] = Header(None),
-    host: Optional[str] = Header(None),
 ):
     user = request.user.object
     start_time = time.time()
@@ -466,10 +464,7 @@ async def search(
         request=request,
         telemetry_type="api",
         api="search",
-        client=client,
-        user_agent=user_agent,
-        referer=referer,
-        host=host,
+        **common.__dict__,
     )
 
     end_time = time.time()
@@ -482,12 +477,9 @@ async def search(
 @requires(["authenticated"])
 def update(
     request: Request,
+    common: CommonQueryParams,
     t: Optional[SearchType] = None,
     force: Optional[bool] = False,
-    client: Optional[str] = None,
-    user_agent: Optional[str] = Header(None),
-    referer: Optional[str] = Header(None),
-    host: Optional[str] = Header(None),
 ):
     user = request.user.object
     if not state.config:
@@ -513,10 +505,7 @@ def update(
         request=request,
         telemetry_type="api",
         api="update",
-        client=client,
-        user_agent=user_agent,
-        referer=referer,
-        host=host,
+        **common.__dict__,
     )
 
     return {"status": "ok", "message": "khoj reloaded"}
@@ -526,10 +515,7 @@ def update(
 @requires(["authenticated"])
 def chat_history(
     request: Request,
-    client: Optional[str] = None,
-    user_agent: Optional[str] = Header(None),
-    referer: Optional[str] = Header(None),
-    host: Optional[str] = Header(None),
+    common: CommonQueryParams,
 ):
     user = request.user.object
     validate_conversation_config()
@@ -541,10 +527,7 @@ def chat_history(
         request=request,
         telemetry_type="api",
         api="chat",
-        client=client,
-        user_agent=user_agent,
-        referer=referer,
-        host=host,
+        **common.__dict__,
     )
 
     return {"status": "ok", "response": meta_log.get("chat", [])}
@@ -554,10 +537,7 @@ def chat_history(
 @requires(["authenticated"])
 async def chat_options(
     request: Request,
-    client: Optional[str] = None,
-    user_agent: Optional[str] = Header(None),
-    referer: Optional[str] = Header(None),
-    host: Optional[str] = Header(None),
+    common: CommonQueryParams,
 ) -> Response:
     cmd_options = {}
     for cmd in ConversationCommand:
@@ -567,10 +547,7 @@ async def chat_options(
         request=request,
         telemetry_type="api",
         api="chat_options",
-        client=client,
-        user_agent=user_agent,
-        referer=referer,
-        host=host,
+        **common.__dict__,
     )
     return Response(content=json.dumps(cmd_options), media_type="application/json", status_code=200)
 
@@ -579,14 +556,11 @@ async def chat_options(
 @requires(["authenticated"])
 async def chat(
     request: Request,
+    common: CommonQueryParams,
     q: str,
     n: Optional[int] = 5,
     d: Optional[float] = 0.18,
-    client: Optional[str] = None,
     stream: Optional[bool] = False,
-    user_agent: Optional[str] = Header(None),
-    referer: Optional[str] = Header(None),
-    host: Optional[str] = Header(None),
     rate_limiter_per_minute=Depends(ApiUserRateLimiter(requests=30, window=60)),
     rate_limiter_per_day=Depends(ApiUserRateLimiter(requests=500, window=60 * 60 * 24)),
 ) -> Response:
@@ -600,7 +574,7 @@ async def chat(
     meta_log = (await ConversationAdapters.aget_conversation_by_user(user)).conversation_log
 
     compiled_references, inferred_queries, defiltered_query = await extract_references_and_questions(
-        request, meta_log, q, (n or 5), (d or math.inf), conversation_command
+        request, common, meta_log, q, (n or 5), (d or math.inf), conversation_command
     )
 
     if conversation_command == ConversationCommand.Default and is_none_or_empty(compiled_references):
@@ -634,11 +608,8 @@ async def chat(
         request=request,
         telemetry_type="api",
         api="chat",
-        client=client,
-        user_agent=user_agent,
-        referer=referer,
-        host=host,
         metadata=chat_metadata,
+        **common.__dict__,
     )
 
     if llm_response is None:
@@ -665,6 +636,7 @@ async def chat(
 
 async def extract_references_and_questions(
     request: Request,
+    common: CommonQueryParams,
     meta_log: dict,
     q: str,
     n: int,
@@ -731,6 +703,7 @@ async def extract_references_and_questions(
                     r=True,
                     max_distance=d,
                     dedupe=False,
+                    common=common,
                 )
             )
         # Dedupe the results again, as duplicates may be returned across queries.