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/wasm.d.ts

@@ -1,9 +1,9 @@
-/// Type declarations for the idfoto WASM module produced by wasm-pack.
+/// Type declarations for the relicario WASM module produced by wasm-pack.
 
 // Ambient module declarations for the WASM glue code.
 // The module specifier must exactly match what's used in import statements.
 
-declare module 'idfoto-wasm' {
+declare module 'relicario-wasm' {
   export default function init(input?: string | URL): Promise<void>;
   export function derive_master_key(
     passphrase: string,