Web: Display the icon of the currently used storage. (#2504)

https://github.com/infiniflow/ragflow/issues/2503


### What problem does this PR solve?

_Briefly describe what this PR aims to solve. Include background context
that will help reviewers understand the purpose of the PR._

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

Before:

<img width="611" alt="image"
src="https://github.com/user-attachments/assets/02a3a1ee-7bfb-4fe0-9b15-11ced69cc8a3">

After:

<img width="796" alt="image"
src="https://github.com/user-attachments/assets/371136af-8d16-47aa-909b-26609d3ad60e">

<img width="557" alt="image"
src="https://github.com/user-attachments/assets/9268362f-2b6a-4ea1-9fe7-659f7292e5e1">

web/src/assets/svg/database.svg

@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
+<svg width="800px" height="800px" viewBox="0 0 1024 1024" class="icon"  version="1.1" xmlns="http://www.w3.org/2000/svg"><path d="M117 608.4v178.5c1.5 93.7 155.7 169.5 395 169.5s393.4-75.8 395-169.5V608.4H117z" fill="#1B9BDB" /><path d="M907 607.7c0 99.4-154.8 180-395 180s-395-80.6-395-180 154.8-180 395-180 395 80.5 395 180z" fill="#FFFFFF" /><path d="M117 428.4v158.5c1.5 93.7 155.7 179.5 395 179.5s393.4-85.8 395-179.5V428.4H117z" fill="#1B9BDB" /><path d="M907 427.7c0 99.4-154.8 180-395 180s-395-80.6-395-180 154.8-180 395-180 395 80.5 395 180z" fill="#FFFFFF" /><path d="M117 248.4v158.5c1.5 93.7 155.7 179.5 395 179.5s393.4-85.8 395-179.5V248.4H117z" fill="#1B9BDB" /><path d="M907 247.7c0 99.4-154.8 180-395 180s-395-80.6-395-180 154.8-180 395-180 395 80.5 395 180z" fill="#3ED6FF" /></svg>