refactor(core)!: rename Provider to LLMProvider and update implementations

- Export `LLMProvider` from `owlen-core` and replace public `Provider` re-exports.
- Convert `OllamaProvider` to implement the new `LLMProvider` trait with associated future types.
- Adjust imports and trait bounds in `remote_client.rs` to use the updated types.
- Add comprehensive provider interface tests (`provider_interface.rs`) verifying router routing and provider registry model listing with `MockProvider`.
- Align dependency versions across workspace crates by switching to workspace-managed versions.
- Extend CI (`.woodpecker.yml`) with a dedicated test step and generate coverage reports.
- Update architecture documentation to reflect the new provider abstraction.

crates/owlen-mcp-code-server/Cargo.toml

@@ -7,15 +7,15 @@ license = "AGPL-3.0"
 
 [dependencies]
 owlen-core = { path = "../owlen-core" }
-serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0"
-tokio = { version = "1.0", features = ["full"] }
-anyhow = "1.0"
-async-trait = "0.1"
+serde = { workspace = true }
+serde_json = { workspace = true }
+tokio = { workspace = true }
+anyhow = { workspace = true }
+async-trait = { workspace = true }
 bollard = "0.17"
-tempfile = "3.0"
-uuid = { version = "1.0", features = ["v4"] }
-futures = "0.3"
+tempfile = { workspace = true }
+uuid = { workspace = true }
+futures = { workspace = true }
 
 [lib]
 name = "owlen_mcp_code_server"