Move Odin renderer into gui/ with per-project Makefiles

Each sub-project (gui, api, infra) now owns its own Makefile, and the
root Makefile is a lean delegator for the base commands (run, build,
test, clean, fmt). Odin source, deps, and web assets live under gui/
(gui/src, gui/lib, gui/www), with scripts kept under gui/scripts for
build tooling only.

.gitea/workflows/deploy.yml

@@ -53,10 +53,8 @@ jobs:
           base: ${{ steps.prev.outputs.prev }}
           filters: |
             odin:
-              - 'src/**'
-              - 'lib/**'
+              - 'gui/**'
               - 'scripts/**'
-              - 'odinfmt.json'
             api:
               - 'api/**'
             infra:
@@ -84,7 +82,7 @@ jobs:
       - name: Build WebAssembly
         run: |
           source /tmp/emsdk/emsdk_env.sh
-          scripts/build_web.sh
+          gui/scripts/build_web.sh
 
       - name: Package
         run: |