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/docs/guide/developer.md

@@ -1,6 +1,6 @@
 # Developer guide
 
-How to set up a local development environment and contribute code to Stirling Image.
+How to set up a local development environment and contribute code to ashim.
 
 ## Prerequisites
 
@@ -14,8 +14,8 @@ Python 3.10+ is only needed if you are working on the AI/ML sidecar (background
 ## Setup
 
 ```bash
-git clone https://github.com/stirling-image/stirling-image.git
-cd stirling-image
+git clone https://github.com/ashim-hq/ashim.git
+cd ashim
 pnpm install
 pnpm dev
 ```
@@ -72,7 +72,7 @@ pnpm test:coverage      # tests with coverage report
 
 ## Database
 
-SQLite via Drizzle ORM. The database file lives at `./data/stirling.db` by default.
+SQLite via Drizzle ORM. The database file lives at `./data/ashim.db` by default.
 
 ```bash
 cd apps/api
@@ -195,13 +195,13 @@ Add a `data-testid` attribute to your action button (as shown above) so e2e test
 Build the full production image locally:
 
 ```bash
-docker build -f docker/Dockerfile -t stirling-image:latest .
+docker build -f docker/Dockerfile -t ashim:latest .
 ```
 
 Use BuildKit cache mounts for faster rebuilds:
 
 ```bash
-DOCKER_BUILDKIT=1 docker build -f docker/Dockerfile -t stirling-image:latest .
+DOCKER_BUILDKIT=1 docker build -f docker/Dockerfile -t ashim:latest .
 ```
 
 ## Environment variables