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/src/content/icon.ts

@@ -21,7 +21,7 @@ export function injectFieldIcons(
   const icon = document.createElement('div');
   icon.textContent = 'id';
   icon.setAttribute('role', 'button');
-  icon.setAttribute('aria-label', 'idfoto autofill');
+  icon.setAttribute('aria-label', 'relicario autofill');
 
   Object.assign(icon.style, {
     position: 'absolute',
@@ -98,10 +98,10 @@ function showPicker(
   candidates: Array<[string, ManifestEntry]>,
 ): void {
   // Remove any existing picker.
-  document.querySelectorAll('.idfoto-picker').forEach(el => el.remove());
+  document.querySelectorAll('.relicario-picker').forEach(el => el.remove());
 
   const picker = document.createElement('div');
-  picker.className = 'idfoto-picker';
+  picker.className = 'relicario-picker';
   Object.assign(picker.style, {
     position: 'absolute',
     right: '0',