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>

crates/relicario-core/Cargo.toml

@@ -0,0 +1,18 @@
+[package]
+name = "relicario-core"
+version = "0.1.0"
+edition = "2021"
+description = "Core library for relicario password manager"
+
+[dependencies]
+thiserror = "2"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+argon2 = "0.5"
+chacha20poly1305 = "0.10"
+rand = "0.8"
+sha2 = "0.10"
+ed25519-dalek = { version = "2", features = ["rand_core"] }
+image = { version = "0.25", default-features = false, features = ["jpeg"] }
+
+[dev-dependencies]