feat: add bump-version.sh script for version management

Automates version bumps across all version source files:
- Cargo.toml (PRIMARY - workspace.package.version)
- debian/changelog (prepend new entry)
- debian/control (update Version field)
- scripts/build-package.sh (update VERSION variable)
- frontend/package.json (update version field)
- Stale references check after bump

Usage: ./scripts/bump-version.sh <new_version> <old_version>

crates/pm-worker/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "pm-worker"
+version.workspace = true
+edition.workspace = true
+authors.workspace = true
+license.workspace = true
+
+[[bin]]
+name = "pm-worker"
+path = "src/main.rs"
+
+[dependencies]
+pm-core = { path = "../pm-core" }
+pm-agent-client = { path = "../pm-agent-client" }
+tokio = { workspace = true, features = ["full"] }
+sqlx = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+anyhow = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
+uuid = { workspace = true }
+chrono = { workspace = true }
+futures = { workspace = true }
+rustls = { workspace = true }
+tokio-rustls = { version = "0.26" }
+rustls-pemfile = { version = "2" }
+tokio-tungstenite = { version = "0.26", features = ["rustls-tls-webpki-roots"] }
+lettre = { version = "0.11", default-features = false, features = ["tokio1-rustls-tls", "smtp-transport", "builder"] }
+reqwest = { workspace = true }