feat(#19): Add filamentcolors.xyz color lookup integration

- Backend proxy endpoints: GET /filamentcolors/manufacturers, GET /filamentcolors/search
- Frontend: FilamentColorLookup modal with manufacturer filter + color search
- Color grid shows swatches with hex codes, click to apply
- Added to both filament create and edit forms next to ColorPicker

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

client/src/pages/filaments/edit.tsx

@@ -8,6 +8,7 @@ import React, { useEffect, useMemo, useState } from "react";
 import { useNavigate } from "react-router";
 import { ExtraFieldFormItem, ParsedExtras, StringifiedExtras } from "../../components/extraFields";
 import { MultiColorPicker } from "../../components/multiColorPicker";
+import { FilamentColorLookup } from "../../components/filamentColorLookup";
 import { formatNumberOnUserInput, numberParser, numberParserAllowEmpty } from "../../utils/parsing";
 import { EntityType, useGetFields } from "../../utils/queryFields";
 import { getCurrencySymbol, useCurrency } from "../../utils/settings";
@@ -248,19 +249,22 @@ export const FilamentEdit: React.FC<IResourceComponentsProps> = () => {
           </Radio.Group>
         </Form.Item>
         {colorType == "single" && (
-          <Form.Item
-            name={"color_hex"}
-            rules={[
-              {
-                required: false,
-              },
-            ]}
-            getValueFromEvent={(e) => {
-              return e?.toHex();
-            }}
-          >
-            <ColorPicker />
-          </Form.Item>
+          <div style={{ display: "flex", gap: 8, alignItems: "start" }}>
+            <Form.Item
+              name={"color_hex"}
+              rules={[
+                {
+                  required: false,
+                },
+              ]}
+              getValueFromEvent={(e) => {
+                return e?.toHex();
+              }}
+            >
+              <ColorPicker />
+            </Form.Item>
+            <FilamentColorLookup onSelect={(hex) => form.setFieldValue("color_hex", hex)} />
+          </div>
         )}
         {colorType == "multi" && (
           <Form.Item