chore: rename project from idfoto to relicario

Sweeping rename across crates, CLI binary, WASM bindings, extension, docs,
and vault metadata paths. Git remote updated to relicario.git.

- crates/idfoto-{core,cli,wasm} -> crates/relicario-{core,cli,wasm}
- IdfotoError -> RelicarioError
- IDFOTO_IMAGE env var -> RELICARIO_IMAGE
- ~/.config/idfoto -> ~/.config/relicario
- .idfoto/ vault metadata dir -> .relicario/ (breaking; pre-release)
- Binary name idfoto -> relicario
- Extension wasm module idfoto_wasm -> relicario_wasm
- Storage key idfotoSettings -> relicarioSettings
- All doc filenames and content references updated

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

extension/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "idfoto-extension",
+  "name": "relicario-extension",
   "version": "0.1.0",
   "private": true,
   "scripts": {
@@ -8,7 +8,7 @@
     "build:all": "npm run build:wasm && npm run build && npm run build:firefox",
     "dev": "webpack --mode development --watch",
     "dev:firefox": "webpack --config webpack.firefox.config.js --mode development --watch",
-    "build:wasm": "wasm-pack build ../crates/idfoto-wasm --target web --out-dir ../../extension/wasm"
+    "build:wasm": "wasm-pack build ../crates/relicario-wasm --target web --out-dir ../../extension/wasm"
   },
   "devDependencies": {
     "@types/chrome": "^0.1.40",