chore: rename Stirling-Image to ashim across entire codebase

Complete rebrand from Stirling-Image to ashim following the project
move to https://github.com/ashim-hq/ashim.

Changes across 117 files:
- Package scope: @stirling-image/* → @ashim/*
- GitHub URLs: stirling-image/stirling-image → ashim-hq/ashim
- Docker Hub: stirlingimage/stirling-image → ashimhq/ashim
- GitHub Pages: stirling-image.github.io → ashim-hq.github.io
- All branding text: "Stirling Image" → "ashim"
- Docker service/volumes/user: stirling → ashim
- Database: stirling.db → ashim.db
- localStorage keys: stirling-token → ashim-token
- Environment variables: STIRLING_GPU → ASHIM_GPU
- Python cache dirs: .cache/stirling-image → .cache/ashim
- SVG filter IDs, test prefixes, and all other references

apps/web/src/hooks/use-auth.ts

@@ -55,7 +55,7 @@ export function useAuth() {
         }
 
         // Auth is enabled — check if we have a valid session
-        const token = localStorage.getItem("stirling-token");
+        const token = localStorage.getItem("ashim-token");
         if (!token) {
           setState({
             loading: false,
@@ -84,7 +84,7 @@ export function useAuth() {
             permissions: session.user?.permissions ?? [],
           });
         } else {
-          localStorage.removeItem("stirling-token");
+          localStorage.removeItem("ashim-token");
           setState({
             loading: false,
             authEnabled: true,

apps/web/src/hooks/use-tool-processor.ts

@@ -1,4 +1,4 @@
-import { PYTHON_SIDECAR_TOOLS } from "@stirling-image/shared";
+import { PYTHON_SIDECAR_TOOLS } from "@ashim/shared";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { formatHeaders } from "@/lib/api";
 import { generateId } from "@/lib/utils";