refactor: DDD/CQRS architecture, unified crate layout

- crates: common→application, api→presentation, infrastructure/*→adapters/*
- new crates: api-types, infra-wiring
- domain: errors/, models/, value_objects/, ports/, services/
- application: CQRS use cases (songs/, tabs/) w/ commands, queries, deps
- unified DomainError replaces RepositoryError
- workspace deps, unused dep cleanup
- fix: parse plain-text chord lines (UG drops spans mid-song)
- tests extracted to separate modules (tests/ dirs)

Cargo.lock

@@ -24,23 +24,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7f202df86484c868dbad7eaa557ef785d5c66295e41b460ef922eca0723b842c"
 
 [[package]]
-name = "api"
+name = "api-types"
 version = "0.1.0"
 dependencies = [
- "anyhow",
- "axum",
- "common",
- "domain",
- "persistence",
- "rand 0.10.0",
  "serde",
- "serde_json",
- "thiserror 2.0.18",
- "tokio",
- "tower-http",
- "tracing",
- "tracing-subscriber",
- "ug-parser",
+]
+
+[[package]]
+name = "application"
+version = "0.1.0"
+dependencies = [
+ "domain",
  "uuid",
 ]
 
@@ -240,17 +234,6 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
 
-[[package]]
-name = "chacha20"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f8d983286843e49675a4b7a2d174efe136dc93a18d69130dd18198a6c167601"
-dependencies = [
- "cfg-if",
- "cpufeatures 0.3.0",
- "rand_core 0.10.0",
-]
-
 [[package]]
 name = "cmake"
 version = "0.1.58"
@@ -270,23 +253,6 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "common"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "async-trait",
- "domain",
- "rand 0.10.0",
- "reqwest",
- "serde",
- "serde_json",
- "thiserror 2.0.18",
- "tokio",
- "tracing",
- "uuid",
-]
-
 [[package]]
 name = "concurrent-queue"
 version = "2.5.0"
@@ -337,15 +303,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "cpufeatures"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b2a41393f66f16b0823bb79094d54ac5fbd34ab292ddafb9a0456ac9f87d201"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "crc"
 version = "3.4.0"
@@ -458,12 +415,9 @@ dependencies = [
 name = "domain"
 version = "0.1.0"
 dependencies = [
- "anyhow",
  "async-trait",
- "rand 0.10.0",
  "serde",
  "thiserror 2.0.18",
- "tracing",
  "uuid",
 ]
 
@@ -745,7 +699,6 @@ dependencies = [
  "cfg-if",
  "libc",
  "r-efi 6.0.0",
- "rand_core 0.10.0",
  "wasip2",
  "wasip3",
 ]
@@ -1081,6 +1034,10 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "infra-wiring"
+version = "0.1.0"
+
 [[package]]
 name = "ipnet"
 version = "2.12.0"
@@ -1452,23 +1409,6 @@ version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9b4f627cb1b25917193a259e49bdad08f671f8d9708acfd5fe0a8c1455d87220"
 
-[[package]]
-name = "persistence"
-version = "0.1.0"
-dependencies = [
- "anyhow",
- "async-trait",
- "common",
- "domain",
- "rand 0.10.0",
- "serde_json",
- "sqlx",
- "thiserror 2.0.18",
- "tokio",
- "tracing",
- "uuid",
-]
-
 [[package]]
 name = "phf"
 version = "0.11.3"
@@ -1584,6 +1524,24 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "925383efa346730478fb4838dbe9137d2a47675ad789c546d150a6e1dd4ab31c"
 
+[[package]]
+name = "presentation"
+version = "0.1.0"
+dependencies = [
+ "api-types",
+ "application",
+ "axum",
+ "domain",
+ "infra-wiring",
+ "sqlite",
+ "tokio",
+ "tower-http",
+ "tracing",
+ "tracing-subscriber",
+ "ug-parser",
+ "uuid",
+]
+
 [[package]]
 name = "prettyplease"
 version = "0.2.37"
@@ -1701,17 +1659,6 @@ dependencies = [
  "rand_core 0.9.5",
 ]
 
-[[package]]
-name = "rand"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bc266eb313df6c5c09c1c7b1fbe2510961e5bcd3add930c1e31f7ed9da0feff8"
-dependencies = [
- "chacha20",
- "getrandom 0.4.2",
- "rand_core 0.10.0",
-]
-
 [[package]]
 name = "rand_chacha"
 version = "0.3.1"
@@ -1750,12 +1697,6 @@ dependencies = [
  "getrandom 0.3.4",
 ]
 
-[[package]]
-name = "rand_core"
-version = "0.10.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c8d0fd677905edcbeedbf2edb6494d676f0e98d54d5cf9bda0b061cb8fb8aba"
-
 [[package]]
 name = "redox_syscall"
 version = "0.5.18"
@@ -2126,7 +2067,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e3bf829a2d51ab4a5ddf1352d8470c140cadc8301b2ae1789db023f01cedd6ba"
 dependencies = [
  "cfg-if",
- "cpufeatures 0.2.17",
+ "cpufeatures",
  "digest",
 ]
 
@@ -2137,7 +2078,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7507d819769d01a365ab707794a4084392c824f54a7a6a7862f8c3d0892b283"
 dependencies = [
  "cfg-if",
- "cpufeatures 0.2.17",
+ "cpufeatures",
  "digest",
 ]
 
@@ -2226,6 +2167,17 @@ dependencies = [
  "der",
 ]
 
+[[package]]
+name = "sqlite"
+version = "0.1.0"
+dependencies = [
+ "async-trait",
+ "domain",
+ "serde_json",
+ "sqlx",
+ "uuid",
+]
+
 [[package]]
 name = "sqlx"
 version = "0.8.6"
@@ -2801,12 +2753,10 @@ checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb"
 name = "ug-parser"
 version = "0.1.0"
 dependencies = [
- "anyhow",
  "async-trait",
  "domain",
  "reqwest",
  "scraper",
- "thiserror 2.0.18",
  "tokio",
 ]