chore(fluentbit): address quick comments

Author: DragonStuff

docs/docs/guides/server-deployment.md

@@ -240,7 +240,7 @@ Fluent-bit supports two modes depending on how you want to access logs.
 
 === "Ship-only mode"
 
-    Logs are forwarded to Fluent-bit but cannot be read through dstack. 
+    Logs are forwarded to Fluent-bit but cannot be read through `dstack`. 
     The dstack UI/CLI will show empty logs. Use this mode when:
 
     - You have an existing logging infrastructure (Kibana, Grafana, Datadog, etc.)

pyproject.toml

@@ -219,7 +219,6 @@ nebius = [
 fluentbit = [
     "fluent-logger>=0.10.0",
     "elasticsearch>=8.0.0",
-    "httpx",
     "dstack[server]",
 ]
 all = [

src/dstack/_internal/server/services/logs/fluentbit.py

@@ -1,6 +1,8 @@
 from typing import List, Optional, Protocol
 from uuid import UUID
 
+import httpx
+
 from dstack._internal.core.errors import ServerClientError
 from dstack._internal.core.models.logs import (
     JobSubmissionLogs,
@@ -146,7 +148,6 @@ def close(self) -> None:
 
 FLUENTBIT_AVAILABLE = True
 try:
-    import httpx
     from fluent import sender as fluent_sender
 except ImportError:
     FLUENTBIT_AVAILABLE = False