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/manifest.json

@@ -1,6 +1,6 @@
 {
   "manifest_version": 3,
-  "name": "idfoto",
+  "name": "relicario",
   "version": "0.1.0",
   "description": "Two-factor encrypted password manager",
   "icons": {
@@ -31,7 +31,7 @@
     "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
   },
   "web_accessible_resources": [{
-    "resources": ["setup.html", "setup.js", "styles.css", "idfoto_wasm_bg.wasm", "idfoto_wasm.js"],
+    "resources": ["setup.html", "setup.js", "styles.css", "relicario_wasm_bg.wasm", "relicario_wasm.js"],
     "matches": ["<all_urls>"]
   }]
 }