feat: implement client backend

This includes temporary AI-generated frontend scaffolding, none of this will be used in production. It was just used during development for the backend.

Cargo.lock

@@ -7,14 +7,22 @@ name = "Tofu"
 version = "0.1.0"
 dependencies = [
  "anyhow",
+ "chrono",
+ "dirs",
  "dotenvy",
  "eyeball-im",
  "futures-util",
+ "hex",
  "matrix-sdk",
  "matrix-sdk-ui",
+ "rand 0.10.3",
+ "serde",
+ "serde_json",
  "slint",
  "slint-build",
  "tokio",
+ "tracing",
+ "tracing-subscriber",
 ]
 
 [[package]]
@@ -1478,6 +1486,27 @@ dependencies = [
  "ctutils",
 ]
 
+[[package]]
+name = "dirs"
+version = "7.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d57d423b3c82e89b9a24ca3091fee61f456a26edbd28d26c65906f4bc1dcd8f"
+dependencies = [
+ "dirs-sys",
+]
+
+[[package]]
+name = "dirs-sys"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e01a3366d27ee9890022452ee61b2b63a67e6f13f58900b651ff5665f0bb1fab"
+dependencies = [
+ "libc",
+ "option-ext",
+ "redox_users",
+ "windows-sys 0.61.2",
+]
+
 [[package]]
 name = "dispatch"
 version = "0.2.0"
@@ -4744,6 +4773,12 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7c87def4c32ab89d880effc9e097653c8da5d6ef28e6b539d313baaacfbafcbe"
 
+[[package]]
+name = "option-ext"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "04744f49eae99ab78e0d5c0b603ab218f515ea8cfe5a456d7629ad883a3b6e7d"
+
 [[package]]
 name = "orbclient"
 version = "0.3.55"
@@ -5174,9 +5209,16 @@ checksum = "e9f068eba8e7071c5f9511831b44f32c740d5adf574e990f946ddb53db2f314e"
 dependencies = [
  "bitflags 2.13.2",
  "memchr",
+ "pulldown-cmark-escape",
  "unicase",
 ]
 
+[[package]]
+name = "pulldown-cmark-escape"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "007d8adb5ddab6f8e3f491ac63566a7d5002cc7ed73901f72057943fa71ae1ae"
+
 [[package]]
 name = "pxfm"
 version = "0.1.30"
@@ -5444,6 +5486,16 @@ dependencies = [
  "bitflags 2.13.2",
 ]
 
+[[package]]
+name = "redox_users"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "60dc65c0ff1a7ae1294b0c67b9f14baf70b644404010370171787bfac1038fc0"
+dependencies = [
+ "libredox",
+ "thiserror 2.0.21",
+]
+
 [[package]]
 name = "regex"
 version = "1.13.1"
@@ -5696,6 +5748,7 @@ dependencies = [
  "indexmap",
  "js_int",
  "js_option",
+ "pulldown-cmark",
  "ruma-common",
  "ruma-html",
  "ruma-macros",