Fix duplicate `pause` and `unpause` definitions in token contract

[PrincessnJoy]

Description

contracts/token/src/lib.rs defines both pub fn pause and pub fn unpause twice each:

Function	First definition (approx. line)	Second definition (approx. line)
pause	~374	~402
unpause	~388	~411

Rust does not allow duplicate function names in the same impl block. This is a hard compile error — the token contract cannot build in its current state.

The duplicate definitions likely originate from a merge conflict that was incorrectly resolved, or from a refactor where the pause/unpause logic was moved but the originals were not deleted.

Steps to Reproduce

cargo build -p cosmosvote-token

Expected error: error[E0201]: duplicate definitions with name pause``

Acceptance Criteria

• Identify which of the two implementations is correct for each function (check event emission, auth checks, and storage operations against the spec in docs/governance-model.md)
• Remove the duplicate definition of pause, keeping the correct one
• Remove the duplicate definition of unpause, keeping the correct one
• cargo build -p cosmosvote-token succeeds without errors
• cargo test -p cosmosvote-token passes all tests
• Pause and unpause emit the correct on-chain events as documented in docs/events.md

Priority

Critical — token contract cannot compile.

Estimated Effort

Small — identify and remove duplicate definitions.