refactor: move firmware workspace under firmware

firmware/Cargo.toml

@@ -0,0 +1,50 @@
+[workspace]
+members = [
+    "boards/geprc-f722-v2",
+    "boards/kakute-f7-mini-v3",
+    "libs/kaptan-actuator",
+    "libs/kaptan-board",
+    "libs/kaptan-control",
+    "libs/kaptan-config",
+    "libs/kaptan-config-derive",
+    "libs/kaptan-config-mavlink",
+    "libs/kaptan-data-channel",
+    "libs/kaptan-dma",
+    "libs/kaptan-drivers",
+    "libs/kaptan-flight-config",
+    "libs/kaptan-flight-runtime",
+    "libs/kaptan-i2c",
+    "libs/kaptan-math",
+    "libs/kaptan-mavlink",
+    "libs/kaptan-log",
+    "libs/kaptan-log-derive",
+    "libs/kaptan-log-mavlink",
+    "libs/kaptan-navigation",
+    "libs/kaptan-safety",
+    "libs/kaptan-sensor",
+    "libs/kaptan-spi",
+    "libs/kaptan-time",
+    "libs/kaptan-tx",
+    "platforms/stm32f7",
+    "tools/sitl",
+]
+resolver = "2"
+
+[workspace.package]
+version = "0.1.0"
+edition = "2024"
+license = "AGPL-3.0-only"
+rust-version = "1.90"
+
+[workspace.lints.rust]
+unsafe_op_in_unsafe_fn = "deny"
+
+[workspace.lints.clippy]
+undocumented_unsafe_blocks = "deny"
+
+[profile.release]
+opt-level = 3
+codegen-units = 1
+lto = "fat"
+panic = "abort"
+strip = "symbols"